"Escaped!" exclaimed Mortlake, but to Roy's quick ears, despite the other's attempt to disguise his relief, it stood out boldly.

"Yes, escaped. Partly owing, I confess, to my overzealousness. There has been foul play here somewhere, Mr. Mortlake."

The officer's voice was stern. His eye flashed ominously. Just then old Mr. Harding came puffing up.

"Oh, so you got the boy, hey?" he cackled, but Mortlake shut him off with a quick word.

"No. This is the real Roy Prescott. It seems that a trick has been put up on us all. The lad we mistook for Roy Prescott was some one impersonating him. This lad has been the victim of a vile plot. While we were watching here for his supposed appearance and the revelation of his treachery, some rascals had locked him in a cellar."

The lieutenant's words were hot and angry. He felt that he was facing two clever rascals, whose cunning was too much for his straightforward methods.

"You—you amaze me!" exclaimed old Mr. Harding, looking in the moonlight like some hideous old ghoul. "What game of cross-purposes and crooked answers is this?"

"That remains to be seen. I shall see to it that an investigation is made and the guilty parties punished."

Was it fancy, or did Roy, for a second, see Mortlake quail and whiten?

But if the boy had seen such a thing, the next instant Mortlake was master of himself.