With Larosière accused of strangling a prostitute, Lampion tries to clear his name.

Sacha escapes from a psychiatric hospital and hides in an isolated house. On the first evening, she has the terrible vsion of a bloody woman, down the stairs. Is it related with a recently deceased woman in a house nearby?

The duet Larosière-Lampion investigate on the murder of a woman, last seen entering a theatre. Meanwhile, the superintendent's daughter Juliette, storms into his life, and might be in danger.