“What’s the matter with you?” he cried, turning to Bob, angrily.
“Nothing! Catch them!”
“There is nobody here.”
“What?” gasped Bob.
He brushed past the man. Sure enough, the room appeared deserted.
“They were here a moment ago,” went on the youth. “Look in the closets.”
“This is some trick of yours,” grumbled the janitor.
Nevertheless he opened the two closets which the office contained. Neither held a single human form.
During this time Bob had entered a private office located in the rear of the main one. Here there was a window opening upon a narrow alley.
The window-sash was raised, and looking out Bob saw that the opening readily connected with a fire-escape.