Marianne wants a divorce but her husband has threatened to kill himself if she insists. She gives in for the moment, but despite everything wants to go through with it. She asks Astrid to help.

Marianne has killed her husband. Apparently a straightforward case of self-defense: Benoît had forced open her door and tried to strangle her. Their son Robin was in the flat, but had neither heard nor seen anything. Astrid asks Alexandre Rotivel to handle the case, but the first elements of the investigation appear to contradict Marianne's version.