Emma had actually been going to primary school, where the teachers said she had been a nice kid from a nice family: popular, well behaved, a people pleaser, no genius but well able to keep up. The floater had a list of teachers and friends. No suspicious knife wounds at the nearby A&E departments, no phone calls to us from the Spains. The door-to-door had turned up nothing: out of maybe two hundred fifty houses, fifty or sixty showed any signs of official occupation, about half of those had someone home, and no one in those couple of dozen knew much about the Spains. None of them thought they had seen or heard anything unusual, but they couldn’t be sure: there were always joyriders, always half-wild teenagers prowling around the empty streets, setting bonfires and finding things to smash.

Jenny’s shopping traced back to the supermarket in the nearest decent-sized town, where at about four o’clock the previous afternoon she had bought milk, mince, crisps and a few other things that the checkout girl didn’t remember—the shop was working on pulling the receipt, and the CCTV footage. Jenny had seemed fine, the girl said, hurried and a bit stressed, but polite; no one had been talking to the family, no one had followed them out, at least not that the girl had seen. She only remembered them because Jack had been bouncing up and down in the trolley, singing, and while she swiped their shopping he had told her he was going to be a big scary animal for Halloween.

The search tossed up small things, low-tide flotsam and jetsam. Photo albums, address books, cards congratulating the Spains on their engagement, their wedding, their babies; receipts from a dentist, a doctor, a pharmacist. Every name and every number went into my notebook. Slowly, the list of question marks was getting shorter and the list of possible contact points was getting longer.

Computer Crime rang me late in the afternoon, to say they had taken a preliminary look at what we had sent them. We were in Emma’s room: I had been going through her schoolbag (lots of pink-based crayon drawings, TODAY I AM A PRINCESS in careful, wobbly capitals), Richie had been down on his hunkers on the floor, flipping through the fairy tales on her bookshelf. With her gone and the bed stripped—the morgue boys had wrapped her sheets around her and taken the lot, in case our man had shed hairs or fibers while he did what he did—the room was so empty it sucked the breath out of you, as if she had been taken away a thousand years ago and no one had stepped in here since.

The techie was called Kieran or Cian or something. He was young and fast-talking, and he was enjoying himself: this was clearly a lot nearer to what he had signed on for than trawling hard drives for kiddie porn, or whatever he usually did with his day. Nothing that stood out on the phones and nothing interesting about the baby monitors, but the computer was a different story. Someone had wiped it.