Marquise de Chaussin

**Isabelle, the Marquise de Chaussin**, was the hidden main villainess of "The Jewel in the Crown," episode 11.21 of *Bones* (airdate July 14, 2016). She was the wife of Henri, the Marquis de Chaussin, as well as the episode's victim—with her corpse being found at a glass recycling plant around 36 hours after her death.

During the Jeffersonian's investigation into the murder, French Inspector Rousseau arrived in the United States, identifying the victim as the Marquise de Chaussin and voicing his belief that her husband killed her. In addition, Isabelle's murder was connected to two jewelry store robberies. The first robbery took place in Paris six months prior, while the second robbery occurred in Washington, D.C. two days before the episode's events. It was determined that one of the robbers was a woman, initially leading to a theory that she was Blake Masters, a 24-year-old University of Virginia graduate who accompanied the Marquis. However, it was disproved after the group inspected surveillance footage of the D.C. robbery, with a further investigation of wounds found on the Marquise's right hand revealing *her* as the female robber.

In the episode's climax, Henri disclosed that he hired Blake to sell his family's heirlooms so he could keep up the prestige that went with his title. However, Isabelle turned heel by masterminding a plan to buy back those heirlooms. The villainess initiated her scheme alongside Chadwick Grey (her illicit boyfriend and a member of the Gemological Society) when they perpetrated the Paris robbery. However, unbeknownst to the sinister Marquise, Chadwick fatally strangled his female scout from in front of her with a garrote before dumping her corpse into the Mediterranean Sea off the coast of Saint-Tropez.

After she and Henri arrived in the United States five days before the episode's events, Isabelle deceitfully claimed to her husband that she was leaving to shop in New York City. The Marquise then found out about how Eve Mayweather, the D.C. jewelry store's saleswoman, had a daughter with heart problems and needed to pay medical bills that were piling up. Subsequently, the illicit couple paid Eve to let them enter her store—with Isabelle informing her when the crown jewels they intended to steal would arrive, being "very nice" to her (in Eve's words), and promising that no one would be hurt. Three days later, the D.C. robbery went as planned, with the Marquise smashing a display case using a hammer she held in her right hand and taking those jewels while she was accompanied by Chadwick. The two masked robbers thanked her for her patience and left, which was followed by Eve fully turning heel and cleaning blood off the case's shattered glass.

Hours before her murder, the Marquise reacted with horror as Rousseau told her about the scout's murder in France. Realizing that Chadwick was responsible for her death, she lashed out at him while they were at her husband's estate in Virginia, planning to turn him over to the police for what he had done and tell Henri about it. In response, Chadwick reluctantly grabbed a 17th century French tapestry and used it to strangle Isabelle to death from behind, but not before she was able to unsheathe a replica of the Topkapi Dagger and stab him in his flank in an attempt to save herself.