Old Mr. Bernard Farrell is known to be immensely rich. No one in his family has seen him for ages. Suddenly he turns up, and is invited to stay for a few days, as he isn't very well. His proposition is, that he would like various of his nephews and nieces to come and stay with him for quite a long time, so that he might gauge which of them should receive the greater part of his wealth after he dies.
The house-party duly convenes, and they don't find him a very agreeable host, but for the most part they persevere. He has made a preliminary will "in case of accident". He is trying to keep this will secret, and of course the young people are all agog to know what is in it. One day he accidentally leaves his desk open, and realises that someone has been at his desk, and has read the will. He calls all the young people to his bed, and asks them point-blank who it was. Of course he gets various kinds of answer, from the offended, to the frightened and cowed. But by chance he finds out exactly who had peeked into his desk and read the will. We won't spoil the story for you, but would say this: that it is as good a Horne Vaizey story as any, even the earlier Pixie books.