Emma had fought; Cooper had told us that already. For a moment she had managed to pull the pillow off her head. As Jenny scrabbled to get it back into place, her bracelet had snagged in Emma’s whipping hair. Emma had grabbed hold of it, yanked till a weak link bent, then lost her grip; her hand had been trapped under the pillow again, nothing left in it but a few strands of her own hair.

The bracelet had stayed on Jenny’s wrist while she finished what she was doing. As she went downstairs to find Pat, the bent link had slipped loose.

Probably it wouldn’t be enough for a conviction. Emma’s hair could have snagged in the bracelet as Jenny brushed it before bed, that last evening; the link could have caught on a door handle as she rushed downstairs to see what the commotion was. The whole thing was dripping with reasonable doubt. But together with everything else, it would be enough to arrest her, charge her, to keep her on remand while she waited for trial.

That can take a year or more. By then Jenny would have spent plenty of time with various psychiatrists and psychologists, who would shower her with meds and counseling and everything else that would give her a chance of stepping back from that windswept edge. If she changed her mind about dying, she would plead guilty: there was nothing else she needed to get out for, and a guilty plea would take the shadow off Pat and Conor both. If she didn’t change her mind, then someone would spot what she was planning—in spite of what some people think, most mental-health professionals know their job—and do what they could to keep her somewhere safe. I had told Fiona the truth: it wasn’t perfect, far from it, but there was no place left for perfect in this case.

Before I left Emma’s room I pulled back one of her curtains and stood at the window, looking out at the rows of half-houses and the beach beyond them. The winter was starting to draw in; it was barely three o’clock, but already the light was gathering that evening melancholy and the blue had leached out of the sea, leaving it a restless gray streaked with white foam. In Conor’s hide, the plastic sheeting thrummed with the wind; the houses around it threw crazy shadows on the unpaved road. The place looked like Pompeii, like some archaeological discovery preserved to let tourists wander through it—openmouthed and neck-craning, trying to picture the disaster that had wiped it bare of life—for a brief few years, until it collapsed to dust, until anthills grew up in the middle of kitchen floors and ivy twined around light fixtures.

I closed Emma’s door behind me, gently. On the landing floor, next to a coil of power cable running into the bathroom, Richie’s precious video camera pointed up at the attic hatch and blinked a tiny red eye to show that it was recording. A little gray spider had already built a hammock of web between the camera and the wall.