In the hot summer of 1872, 11 men died in their beds in the wet bayus of southern Louisiana. Not because of yellow fever or consumption.

While he slept, each one had his throat cut open with surgical precision. Their bodies were found at dawn with looks that were stuck between happiness and fear. All 11 were well-known members of the Knights of the White Chima, which was the most feared chapter of the Ku Klux Clan in the area.

Local officials wrote reports that said the deaths were unrelated events that happened in four parishes. These reports went against witness statements and physical evidence. The case was quietly closed after six months and the parish judge ordered all records to be sealed.

But in the small rooms of the coloured sections and the back rooms of Freriedman’s churches, another story was going around. This story would be whispered for generations, never written down, and never spoken out loud where white people could hear it. Finally, that story can be told tonight.

The story doesn’t start in 1872. It starts four years earlier in the ashes of a war that was supposed to be over. In 1868, Street Martin Parish was a wound that wouldn’t heal.

The big plantations that used to grow tonnes of sugar and cotton now looked like rotting teeth against the Louisiana sky. Their fields were turning back into swamps and federal troops were living in their manor houses or letting them fall down under the weight of their own former glory.

Bro Bridge was the parish seat. It was a group of weathered buildings around a courthouse that had changed flags three times in seven years. The old planter class was scared by how the population had changed.

Almost 4,000 former slaves were now free to walk around in streets where they had once been told not to even look white people in the eye. Some of them owned land. They voted and Union soldiers and the Freriedman’s Bureau kept them safe.

They testified against white defendants in court, which was so against the natural order that many long-time residents called it an apocalypse, the end of civilisation itself. As a result, the Knights of the White Chima came together from the ashes of Confederate veteran groups and local militias.

The Louisiana Knights were proud of how sophisticated they were compared to their more famous counterparts in other states. They didn’t wear hoods or burn crosses. They were lawyers, merchants, former officers and plantation owners who were trying to save what was left of their businesses.

They were in charge of the local courts, the sheriff’s office and the parish council. They didn’t need to put on a show. They had power. Their plans were precise.

If a Freman spoke too freely in town, his crops might be burned, his mule might be hamstrung, and his credit at the general store might be taken away.

A man of colour who registered to vote might get a visit at night from well-dressed men who politely told him why he should think about it again. Violence was only used on people who wouldn’t listen. And even then, it was planned to send a message without getting the federal government involved.

Every Thursday night, the Knights met in a backroom of the Bro Bridge Hotel, a three-story hotel on Main Street owned by Harold Jessup, one of the Knights founding members. There were 11 men in the inner circle.

They made the decisions about which freed men needed to be reminded of their place, which white Republicans needed to be pushed to leave the parish, and which federal sympathisers needed to be pushed harder.

A woman named Celeste Defrain walked into this powder-keg on a Tuesday morning in late April. She got off the steamboat from New Orleans in Bro Bridge with just one trunk and a black silk parasol.

She looked to be about 30 years old but her face had a quality that made it hard to tell her age. She wasn’t young or old. She was somehow outside the normal flow of time.

Her skin was the colour of cafe Olay, which is a colour that can mean anything from Creole aristocracy to mixed parentage from a dozen different places in Louisiana. She wore expensive morning clothes that needed a skilled seamstress and fine fabric to make, which showed her wealth and status.

She paid for a room at the Bro Bridge Hotel a month in advance with gold coins that she counted out one by one on Harold Jessup’s front desk. Her French was perfect, and her English had a Parisian accent that the locals found interesting.

She said she was the widow of a French merchant who died in New Orleans during the yellow fever outbreak of the summer before last. She said she was looking to buy land in the parish, maybe a small house with land where she could live peacefully away from the disease and chaos of the city.

The story made sense. New Orleans had really been hit hard by an epidemic. French traders did business all over Louisiana. Well-bred Creole widows often went to live in smaller towns to get away from it all.

There was something about Celeste frame that made people not want to ask her too many questions. She had a dignity and self-control that made it seem like she was used to being treated with respect.

Every Sunday morning, she went to mass at Street Bernard Catholic Church and sat in the section set aside for Creole families of standing. She ate in the hotel dining room by herself every day, reading French novels or writing letters in a neat, precise hand.

She walked around town in the afternoons with a parasol over her face, nodding politely to people she passed, but not starting any conversations. She didn’t seem to care about the racial tensions that were tearing the parish apart. She didn’t have any political views or ties to either the Freriedman’s community or the federal government.

In less than two weeks, she had every man on the Knights Council’s attention. It all started out fine.

Thomas Brousard, who owned 1,500 acres of cotton fields east of town that weren’t doing well, ran into her outside the general store on a Wednesday afternoon. She was looking at a piece of fabric and moving her gloved hands over it with skill. He said he would help.

He said he knew the merchant and could make sure she got a fair price. She smiled at him and it looked like she was both thankful and a little amused, as if she thought his chivalry was sweet but not needed. They talked for about 10 minutes.

During that time, she talked about how hard it was for her to find a good place to live, how she didn’t know much about the area, and how she was relying on the kindness of strangers during this hard time of mourning.

Brousard thought about her all day. There was something about her that drew him in, but he couldn’t put his finger on it. She was beautiful, but it wasn’t just that. It was a kind of focused attention that made you feel like you were the only person in the world who mattered when she looked at you.

He felt the touch like an electric current when she lightly touched his arm and thanked him for his help.

He started looking for excuses to be in the hotel lobby when she walked by. He said he would show her homes that might work for her. She said yes with a humility that seemed to show that she understood both his kindness and her own vulnerable position as a woman alone.

Over the next few days, they rode out to several parcels, always with someone else nearby to keep an eye on them, and always finished before sunset. Brousard told his wife that these were possible business deals and that he was helping a good widow like any Christian man would. But he couldn’t stop thinking about Celeste.

How the candle light caught the curve of her neck, how her clothes smelled like lavender, and how her eyes sometimes looked at him with an expression that seemed to see through all of his careful respectability to something raw and hungry beneath.

The other knights saw that Brousard was distracted and over time a few of them started to get to know Madame Defrain.

Antoine Lair, a lawyer who had defended a number of clan members in federal court said he would help her with property transfers if she needed it. Dr Raymond Heber, the parish coroner, was worried about her health, the stress of being a widow, and the change in climate. He suggested that she might benefit from a consultation.

Eugene Fontineau, who owned the parish’s biggest dry goods store, gave her a generous line of credit for anything she might need for her home once she found it.

Celeste politely turned down every offer, never seeming to want attention, but somehow making each man feel like he was the only one who understood her situation and could give her what she needed. They told themselves that she was a good woman who was going through a tough time.

Their interest was only polite. It was only natural for them to think about her, to come up with reasons to go to the hotel, and to compare her refined ways to their wives more simple ones.

By June, the way the knights interacted during their Thursday meetings had changed in small ways. The 11 men who had always worked together like soldiers now had small rivalries and competitions for status and standing.

Brousard talked about how he and Madame Defrain would drive around in the afternoon. Lair fought back with his legal advice. Heert talked about her weak health and how she needed to see a doctor on a regular basis. Jessup the hotel owner, Marcos Tibido, who ran the parish newspaper. Judge Vincent Theo who ran the local courts. Sheriff Claude DVO. Banker Fip Russo. Plantation owners William Duplantis and Charles Arseno. Each found their own way to get to know the interesting widow.

None of them realized that Celeste had never really bought any property. No one asked why a woman who was supposedly running away from New Orleans would choose Brobridge, a violent backwater torn apart by racial conflict.

No one thought it was strange that she seemed so calm for a grieving widow. She never cried or talked about her dead husband in any clear way. And none of them knew that Celeste Defrain sat at the small desk in her room late at night when the hotel was quiet and wrote down notes in a leather-bound journal.

She wrote down each man’s habits, weaknesses, secrets, sins, where he lived, who guarded his house, whether his wife slept soundly, whether he kept weapons near his  bed, and everything else she would need to know when it was time to collect her debts.

Celeste Frame, if that was even her real name, didn’t come to Bro Bridge to buy a house, mourn her husband, or get away from yellow fever. She had come for a very specific reason that required her to be patient, plan ahead and be ready to use every weapon she had. She had come to kill 11 men.

The first death happened on July 19, 1872, during the hottest heatwave anyone in Street Martin Parish could remember. At dawn, Thomas Brousard’s wife found his body.

He was lying in their bed in the plantation house his father had given him. The cut was so deep that it almost reached his spine and it opened his throat from ear to ear. The sheets, mattress, and floor next to the bed were all soaked with blood.

His face was calm, but the wound was very violent. His eyes were closed. His face was calm, and his hands were at his sides as if he had just fallen asleep and never woken up. The staff came running when Mrs Bruard screamed.

One of them was an old black woman named Esther who had worked for the family since before the war. First as a slave and now as a paid servant. Years later, Esther would talk about what she saw when she walked into that bedroom, but her testimony would never be put in official records.

Not just the body or the blood, but something else that didn’t make sense, and she knew right away that she should never tell white people about it. There were two empty wine glasses on the nightstand.

The room smelled like lavender and something else, something sweet and natural that Esther couldn’t put her finger on. Mr Brousard was only wearing his night shirt, which was bunched up around his thighs. The bed clothes were messed up in a way that made it look like there had been a lot of activity before death.

Mrs Brusard had been sleeping in a bedroom next door because she had trouble sleeping and often took separate rooms to avoid waking her husband. However, there was clear evidence that Brusard was not alone when he died. Within an hour, Sheriff DVO and Dr Heert were there.

They looked around the house, talked to the servants and came up with the official story. Thomas Brousard was killed by an intruder, probably a freed man with a grudge, who snuck into the house at night and cut his throat while he slept.

The fact that there were no signs of a struggle made it seem like the killer was quick and skilled. Nothing had been stolen, which meant that this was personal and not a robbery. The sheriff thought it might have been revenge for one of the many warnings the knights had given to uppidity black people in the last few months.

But Esther found something that the white man had missed or chosen to ignore when she cleaned the room after the body was taken away. There was a single long, dark and shiny hair caught in the floorboards near the bed. It was too fine to be Mrs Brousard’s. She found more than just blood on the sheets when she took them off.

There were other fluids there, proof of things that good people didn’t talk about, but that every woman knew about. She didn’t say anything. He did what Mrs Brousard told her to do and burned the sheets.

She cleaned the floors, scrubbed the blood stains, and opened the windows to let in the smell of death and secrets.

And when the other servants asked her what she’d seen, she told them only what would keep them safe, that Mr Brousard had been killed by an intruder; that the sheriff was investigating; that they should all be careful not to go out alone at night.

But in the coloured part of town, where people had learned to see what white people didn’t want to see, a different story started to spread. It was about the beautiful widow who had just moved to town and caught the attention of many important men.

It was also about Thomas Brousard’s frequent visits to the hotel, how he looked at Madame Defrain, the afternoons he spent showing her properties that he never seemed to mention to his wife, and how convenient it was that a man known for being cruel to freed men had his throat cut just days after being seen having dinner with the mysterious Creole widow.

The whole town came out to pay their respects at the funeral on a Saturday. The knights came as a group and stood together near the grave looking serious. These men were not stupid. They knew that killing one of their own was a message and a declaration of war.

They thought it came from the freedman’s community or people who were sympathetic to the government. They talked quietly about how to react, what steps to take, and which coloured leaders should be punished.

No one noticed that Celeste was also at the funeral. She stood at a respectful distance, wearing a black veil and bowing her head as if she were praying. None of them saw the small, satisfied smile on her lips when she thought no one was watching. And none of them knew that there would be another funeral in three weeks.

• A Tell Media report / Source: Family Stories