"What made you come into my room?" demanded Mark, who now appeared on the scene.
"I didn't know whose room it was. I thought it was my own."
"How did you get in? The door was locked."
"No, it wasn't," answered Buffington boldly. "You thought you locked it, but you didn't. Trying the knob it opened at once, and I supposed it was my own which I had left unlocked."
"Is that true?" asked the watchman, looking doubtfully at Mark.
"No, it isn't. I took special pains to lock the door, for I knew that there was a possibility of my room being entered."
"Then he must have got through the transom. We have had such cases before."
"If you have finished asking foolish questions I will go back to bed," said Buffington with remarkable assurance.
"Wait a minute. Did you see this man in your room?"
The question was addressed to Mark.