"Only if there is something to find out, silly," said Pip. "Oh! I forgot to tell you, Fatty is coming for the holidays too. His parents liked Peterswood so much when they stayed here at Easter, that they have bought a little house, and Fatty will be here for the hols."

"Oh, good!" said Bets happily. "I like Fatty. He's kind to me. We shall really be the Five Find-Outers again then; and oh, Pip! I suppose Buster is coming, isn't he?"

"Of course," said Pip. Buster was Fatty's little black Scottie dog, loved by all the children. "It will be nice to see old Buster again."

"How do you know about Fatty coming?" asked Bets, still trotting round after Pip.

"He wrote to me," said Pip. "Wait a minute — I've got the letter here. He sent a message to you in it."

The boy felt in his pockets and took out a crumpled letter. Bets took it from him eagerly. It was very short, written in extremely neat handwriting.

"DEAR PIP, — Just to say my parents have bought White House, not far from you, so I'll be seeing you in the summer hols. Hope we have another mystery to solve. It would be fun to be the Five Find-Outers and Dog again. Give my love to little Bets. I'll pop down and see you as soon as I get back. — Yours,

FREDERICK ALGERNON TROTTEVILLE."

"Why doesn't he sign himself Fatty?" asked Bets. "I think Frederick Algernon Trotteville sounds so silly."

"Well, Fatty is silly sometimes," said Pip. "I hope he won't come back full of himself. Do you remember how he kept boasting about his marvellous bruises last hols, when he fell off that hayrick?"