Thomas confide only to his dairy that he's afraid to continue studying Catherine, being convinced her first killing, albeit a serial killer, was a test starting her off to become one. Blinded by her own abuse frustration, Catherine initially refuses to look for another suspect the father Robert Walker, respectable friend of the commissioner's son, when his tortured wife and kids' corpses are found at home. Luckily Bisgaard gets a profile from Thomas, who disagrees and finds evidence it was a stalker camping inside before trying to replace the father, whose corpse is later found. Alas his nocturnal 'recontruction' at home convinces Thomas's wife Benedicte he can't be trusted anymore with their doting son, whom he forgot t pick up once more, so she decides to move out. An ex-con pest exterminator whose fingerprints were found is arrested, but has an alibi while the killer strikes again in another home, causing Catherine to be called on duty before she can again seduce her happily ...