"Here is a man who saw it!" he cried. "He will tell you that I am not lying."
The engineer turned to the stoker.
"How did he happen to fall?" he asked.
"He didn't fall," declared the begrimed coal heaver.
"No? What then—"
"'Nother chap jumped on his back and flung him down. It's wonderful he wasn't killed."
Frank was triumphant. He regarded the engineer and his assistant with a grim smile on his face.
"This is incredible!" exclaimed the engineer. "Who could have done such a thing?"
"Somebody who came from this room!" rang out Merry's clear voice.
"This shall be investigated!" declared the engineer. "Look around! See if you can find the man who attacked you. The only ones here are myself, Mr. Gregory, and the wipers."