Tom's cry came to a sudden end, for without warning a billet of wood struck him fairly on top of the head and he went down as if shot.
By this time Dick was on his feet.
"What's up, Tom?"
"I—I—oh, my head?"
"Did somebody hit you?"
"Yes."
Sam was running after Baxter and Flapp. But they reached the factory first and banged the door full in the face of the youngest Rover.
"Open that door, Dan Baxter!" called out Sam.
"All right!" was the sudden reply, and open flew the door. Then down on poor Sam's head came a heavy billet of wood and he pitched backward unconscious. Then the door was closed once more and locked from the inside.