Police manage to get their suspect remanded in custody, but a series of unexpected revelations threatens to jeopardise the solidity of their case. The infamous accused, by now known as the Butcher of La Villette, is defended by none other than the fearsome Josephine Karlsson. Judge Roban's uncharacteristically hasty actions are thought to compromise his impartiality. Settling in his new role as barrister, Pierre Clement finds himself roped into dealing with an unusual case.

In spite of the evidence, and of protestations from members of her team, Captain Berthaud continues to believe that the Butcher of La Villette remains at large. At the same time, Bremont grows suspcious of her affections. Clement defends a young offender with a troubled past and feels sorry for him, while Judge Roban ploughs on with his corruption enquiry, sparing no-one in the process.