“That is the mystery,” replied Frank’s uncle. “The door was locked as usual, and the window-catches all in place.”
“Why, then, they must have had a key,” said the marshal.
“Evidently they did.”
“The lost key—do you remember?” Bob whispered to Frank, in an excited tone.
“Some one found it!”
“Yes!”
“And let himself in here! Who could have done it?”
Before Bob could reply, Mr. Haven sank into a chair with a groan.
“They have taken everything,” he declared, “the silverware, the watches and chains, and all the solid gold goods we carried.”