Enid Blyton 
The Mystery of the Hidden House [EPUB ebook] 

“It’s today that Fatty’s coming back, ” said Bets to Pip. “I’m so glad.”
“That’s the sixth time you’ve said that in the last hour, ” said Pip. “Can’t you think of something else to say?”
“No, I can’t, ” said Bets. “I keep on feeling so glad that we shall soon see Fatty.” She went to the window and looked out. “Oh Pip—here come Larry and Daisy up the drive. I expect they will come to the station to meet Fatty too.”
“Of course they will, ” said Pip. “And I bet old Buster will turn up as well! Fancy Fatty going away without Buster-dog!”
Larry and Daisy walked into Pip’s play-room. “Hallo, hallo!” said Larry, flinging his cap on a chair. “Won’t it be nice when Fatty’s back? Nothing ever seems to happen unless he’s around.”
“We aren’t even the Five Find-Outers without him, ” said Bets. “Only four—and nothing to find out!”