She looks like a jumper to me. Jumpers do that a lot, stand on the edge and stare out. Never kill yourself in a Tube station. Tip number one. You might end up down here forever, staring at the wall." Stephen coughed a little. "Just giving advice," Callum said.

A pause while my mother made high-pitched sisterly devotions of gratitude.

Life is always going to be a series of ouch-making moments, and the question was, was I going to go all fetal position, or was I going to woman up? I went into fetal position on the bed to think about this. Fetal position turned out to be very comfortable.

I knew it was beautiful, but knowing something is beautiful and caring about it are two very different things, and I didn't care.

Sometimes people graduate but they don't leave. They hang around for years, for no reason. I would think of ghosts like that, I decided.

It rang and it rand and it rang. I looked at the screen one last time, then at Stuart, and then I reached my arm back and threw the phone as hard as I could (sadly, not that far), and it vanished into the snow. The eight-year-olds, who were truly fascinated with our every move at this point, chased after it. 'Lost it,' I said. 'Whoops.

Walk really, really carefully. It's not complicated, but if you mess up, you'll die, so pay attention.