“How about your mother?”
“We never thought of that. I’ll go and find out.”
Guy found his mother and put the question to her. She thought rapidly a few moments, then replied:
“No, I’m afraid I’ve lost it. Haven’t you got it?”
“No,” the boy answered. “When did you have it last?”
“Just before luncheon, I think. I left my key in the door on the outside, and we came out through your room.”
“Then somebody stole your key. Of course, it was Watson. But maybe he left it in the lock—I didn’t notice—I’ll go and see.”
Guy went to his mother’s room and found the key in the lock. Then he hurried back and reported his discovery. Soon afterward he met Gunseyt again and told him the latest development of the key mystery.
“That explains the whole affair,” declared the man with the goatee. “Now, you see, my advice to look out for Watson was good advice, wasn’t it?”
“Yes, it was,” admitted the boy.