“Oh, it wasn’t a robbery,” laughed Billy. “It was something much smoother. I’ll get to it in a minute. You know already about our going sightseeing yesterday and then coming here. Well, when we got home there was a note from Trevelyan’s missing sister.” Billy paused. “Come to think of it, I didn’t see that note. But if I had, it might have been faked just the same. Anyhow Trevelyan said there was a note from his sister to say that the countess was prostrated by the heat, and they’d had to hurry home right after lunch. That sounded perfectly reasonable. It was a beastly hot day, and of course if the countess was sick, somebody had to go home with her. The sister said also that she was beginning to be in a hurry to get into her own house, and Trevelyan said that if I didn’t mind he guessed we’d better do a little shopping this morning. It seems that his sister had ordered different things for the house put aside for his approval, and he was to go to the shops and look at them and have them sent out.” Billy paused reflectively. “Sounds reasonable enough, doesn’t it?”