John studied me speculatively. I scooted back, out of his reach. ‘Oh, no, you don’t. Not another sock on the jaw, for my own good.’

‘It’s a tempting idea. But in this case it might do more harm than good. Besides, you’d probably hit me back. Come along, then. And don’t forget what I told you.’

The stairs ended at another closed door. When John eased it open I started; the voices sounded as if they were only a few feet away. They were. The room to our left was the kitchen. I could smell cooking and hear pots and dishes rattling.

John went the other way, moving as soundlessly as if he too were barefoot. I hadn’t been in this part of the house and I had no idea where we were or where we were going, so I stayed close on his heels. When he opened the next door I did know where we were, and that encouraging old adage about the frying pan and the fire came back to me. Ahead was the main hall of the house, lighted like a stage by the hanging brass chandelier and a dozen sconces. The open archway to my right led to the parlour. Lights blazed from that room as well; in another forty minutes, give or take five minutes, Larry and his ‘guests’ would be entering it. On my left was the staircase. I’d have preferred to stay in the illusory safety of the shadows cast by that massive structure, but John didn’t pause. He walked unconcernedly past the foot of the stairs and entered the corridor that led to the library and Larry’s study.

Apparently he had been right about the household schedule. We met no one. When we reached the study John’s fingers pressed a switch and prodded a button, both concealed in the carving of the frame, before he turned the knob. So, I thought, this wasn’t the first time he had enjoyed Larry’s hospitality. He was one of the world’s most efficient snoops, but even he coudn’t have discovered so many usefal details in two days.

It was at this point that John’s theories failed. I suppose it was something of a compliment to me that Larry had taken the precaution of stationing a guard in his study. Or, to look at it another way, it was something of an insult. Had he really believed I’d be foolhardy enough to return? Well, he had been right. And if I had been looking for evidence of guilt, this was where I’d have looked first.