"'Why are you burning a body?' the disturbed firefighter asked the homeowner, Ouissem Medouni, Hunt would later testify. 'It’s a sheep,' Medouni, a French Algerian financial analyst, replied. 'Bollocks,' the firefighter answered. Later, Hunt would tell a court Medouni then insisted the remains were from an animal, but that a look of 'resignation' crossed his face, as if 'the game’s up.'"

From "A London couple’s shared delusions led to the torture and death of French au pair" (WaPo).

[T]he judge in the case noted the crime was a remarkably rare instance of “folie a deux” — or dual psychosis. [Sabrina] Kouider, diagnosed with depression and borderline personality disorder, had affected [infected?] her lover with her own unhinged delusions. The testimony presented at the trial showed the couple submitted the young au pair to starvation and brutal torture until she admitted her part in the fantasy that had twisted both Medouni’s and Kouider’s minds — a convoluted paranoia about Kouider’s ex-boyfriend, a famous Irish pop star.... Mark Walton... of the 1990s boy group Boyzone....

Fifteen months before her death, Sophie Lionnet had come to work for Kouider and Medouni..... At the trial, prosecutors stated that during the last six weeks of Lionnet’s life, the couple had become convinced Walton had seduced Lionnet, and that in return the au pair was drugging Medouni so Walton could sneak into the home and sexually abuse Medouni.

The couple began starving Lionnet and subjecting the au pair to brutal interrogation sessions, beating and dunking her head underwater until she admitted she was in league with Walton, according to testimony. The couple recorded the sessions on their cellphones. Police recovered eight hours of interrogation footage.

“So where is [Mark Walton’s] house? Because you fancy him, he is charming. . . . I don’t think he abused you, you wanted it,” Kouider told the au pair in one of the final sessions, according to the Telegraph. “And whenever you come back to the house, I smell sex.”