“Well, I guess that couldn’t exactly happen,” replied Joe with a funny little smile. “But something has happened, all right. Model airplanes don’t disappear and deer don’t suddenly appear and sisters don’t vanish after they cry for help—not unless something has happened.”

“This sure is a mystery, fellows!” Teddy exclaimed. “Isn’t it queer how I always seem to get mixed up in a mystery? First it was a dog and then a monkey and now—”

“The way it looks to me,” interrupted Joe, “is that you have all the mystery fun, Teddy.”

“That’s right!” chimed in Joe. “We hardly ever get a chance.”

“Say, look here!” cried Teddy. “That’s right. But you fellows are going to be in on this mystery. How about forming a Mystery Club? Just us three?”

“Swell!” exclaimed Joe.

“All right,” went on Teddy. “Then the Deer Mystery Club is hereby formed. What’s the first order of business?”

“I think,” said Joe, “we ought to notify the police that our toy planes are missing.”

“And so are Margie and Lucy,” said Teddy. “The girls ought to come first. If they have really disappeared, I think we should—”

He was interrupted by a loud voice shouting: