‘Most people spend their time looking up,’ she said eventually, ‘looking at the stars. You seem to spend far too much time looking down. What are you looking for, exactly?’

‘Perhaps I’m looking for fallen stars,’ he said after a moment.

‘It’s the people, isn’t it? You just can’t help watching them.’ She caught herself. ‘No, that’s not it. You’re not watching them; you’re watching over them.’

‘Ever seen a two-year-old tottering around a garden?’ he said softly, without turning around. ‘There might be poison ivy, or rose bushes, or hawthorn around the edges. There might be spades or secateurs lying on the lawn. The kid doesn’t care. He just wants to play with all those brightly coloured things he sees. To him, the world is a safe place. And you might want to rush out and cut back all those sharp, spiky plants so they can’t hurt him, and you might want to clear away all those dangerous tools just in case he picks them up and cuts himself on them, but you know you shouldn’t, because if you keep doing that then he will either grow up thinking the world can never hurt him, or he might go the other way and think that everything is dangerous and he should never go far from your side. So you just watch. And wait. And, if he does get a rash from the poison ivy, or if he does cut his finger off with the secateurs, then you get him to hospital as quickly as you can, in the reasonably sure knowledge that he’ll never make that mistake again.’

‘Like a tuning fork inducing sympathetic vibrations in a wine glass,’ Toshiko said, nodding.

Owen suddenly perked up. ‘I could do with one of those.’

‘You already have one of those,’ Jack said. ‘It’s called “common sense”. You ask yourself the question “Does she want a shag?” And your common sense chips in with the answer: “No, of course she doesn’t. I’m unshaven and seedy. She would rather stick knitting needles in her eyes.”’

Somewhere in the Archive, there was a section devoted to the records left behind by other Torchwood members; ones who had been carrying out experiments, just as Toshiko was. Ianto had showed her where it was, once upon a time. Videos. Photographs. An ancient daguerreotype. And one scratchy old wax cylinder that, Ianto told her, contained a man’s voice talking very calmly up to the point when he suddenly let out the most God-awful scream that Ianto had ever heard.