Tilda finds she cannot step forward. The calm that she has acquired while with Professor Williams is leaving her, minute by minute. Her pulse begins to race as if she has just run up the hill to Ty Gwyn, for she knows beyond doubt that if she touches the clock it will stop again. And this time there will be a witness to the madness. The professor will see that it is she who is causing the clock to stutter and fail. Just as the lights failed at the cottage. Just as the computer failed.

Because of her.

And I won’t be able to pretend otherwise any longer. Not even to myself.

‘I’m sorry,’ she blurts out, ‘I really have to go.’ Hurrying to the doorway, she jams on her sneakers, hat and jacket as the professor chatters on about tea and clocks and the fog having lifted outside. She scarcely hears what he is saying as she mumbles a good-bye and hurries through the heavy oak front door, breaking into a run the second she turns in the direction of home.

*   *   *

Two days after meeting Professor Williams, Tilda steels herself to visit the busy side of the lake. Ordinarily, she would avoid the bustle of such a place, with its boats for hire, ice-cream van, café, sailing club, campsite, and so on, but the more she thinks about it, the more she knows she must go there. However much tea and a chat with the professor helped her to shrug off what she saw in the mist that morning, time on her own has forced her to think again. Try as she might to convince herself that what she saw was nothing more than a trick of the eerie light combined with low blood-sugar levels, she cannot shake off the feeling that there was more to it than that. On top of which, her own effect on the grandfather clock still disturbs her. She cannot see how, if, the two things are in any way connected, and yet there is a niggling sense that they must be. On her return to the cottage that same day the lights had fused again. Not when she first arrived home, but after she had been there an hour or so.

Something is going on. Either I’m losing my mind, or there is another explanation.