corrected himself. âPeople who are split in two.â
The doctor pulled a face.
âLetâs just say individuals who are made up of two distinct parts: one that kills, one that leads a normal life â and both halves are almost entirely unconscious of the otherâs existence. Itâs quite rare. For instance, that district nurse they arrested in Asnières, two years ago. This kind of murderer is dangerous, and recidivist, and almost impossible to spot. Nobody suspects them, not even themselves, and they go to extraordinary lengths to stop the other half of themselves from finding out.â
âI remember the nurse. So, according to you, she was a dissociated killer, was she?â
âAlmost the classic case. If she hadnât crossed the path of some genius in the police force, sheâd have gone on killing people until the day she died, and denied it to herself. Thirty-two victims in forty years, without turning a hair.â
âThirty-three,â Adamsberg corrected her.
âThirty-two. Iâm well placed to tell you, I interviewed her for hours.â
âIt was thirty-three, Ariane. I arrested her.â
The doctor paused, then smiled.
âAh, did you now?â
âSo when the Le Havre killer cut open those rats, he was the other part of himself. Number Two, the murderous one?â said Adamsberg.
âAre you interested in dissociation?â
âThat case of the nurse still haunts me, and the Le Havre man sort of belongs to me too. What was his name?â
âHubert Sandrin.â
âAnd when he confessed? Was he still the other one then?â
âNo, that would be impossible, Jean-Baptiste: the other one never denounces himself.â
âBut Number One couldnât confess, because he didnât know about the murder.â
âThatâs the point. For a few moments, the dissociation stopped working and the barrier between the two selves opened up, like a crack in a wall. And, through the crack, Hubert Number One saw the other one, Hubert Number Two, and was overcome with horror.â
âAnd that sometimes happens?â
âHardly ever. But dissociation is rarely perfect. There are always a few leaks. Odd words leap from one side of the wall to the other. The murderer doesnât notice, but an analyst can surprise them. And if the jump is too abrupt, it can cause a breakdown, a personality crash. Thatâs what happened to Hubert Sandrin.â
âWhat about the nurse?â
âHer wall has stayed intact. She has no idea what sheâs done.â
Adamsberg seemed to be thinking, rubbing his cheek with his finger.
âThat surprises me,â he said quietly. âIt seemed to me she knew perfectly well why I was arresting her. She came along like a lamb, without a word.â
âPart of her did, which explains her consent. But she has no memory of her actions.â
âTell me something. How did the guy in Le Havre find out about his other self?â
Ariane smiled broadly, flicking her cigarette ash to the ground.
âIt was because of you and your rats. At the time, the local press made a bit of a song and dance about them.â
âYes, I remember.â
âWell, Hubert Number Two, the murderer â letâs call him Omega â had kept newspaper cuttings, out of sight of Hubert Number One â letâs call him Alpha.â
âUntil Alpha found the cuttings that Omega had hidden away?â
âExactly.â
âDo you think Omega had wanted that to happen?â
âNo. Alpha simply moved house. The cuttings fell out of a cupboard. And it detonated the explosion.â
âSo if it hadnât been for my rats,â Adamsberg summed up quietly, âSandrin wouldnât have denounced himself. Without his case, you wouldnât have started working on dissociation. Every psychiatrist and detective in France knows about your