As Tom and the motor boat's engine tender reached the little, box-like shack from which Evarts's tones proceeded, four men, seated on the floor, were seen to be lacing their shoes by the dim light of a lantern.

"A nice lot you are!" called Tom crisply. "How many hours does it take you to get awake when you're called in the middle of the night?"

"This overtime warn't in the agreement," sleepily retorted one of the men.

"You're wrong there," Reade informed him, vehemently. "Overtime is in the agreement for every man in this camp when it's wanted of him—-from the chief engineer all along the line. Now, you men oblige me by hustling. I don't want to wait more than sixty seconds for the last man of you."

"I've a good mind to crawl back into my bunk," growled another of the men.

"All right," retorted Tom Reade, with suspicious cheerfulness. "Try it and see what kind of fireworks I carry concealed on my person. Or, just lag a little bit on me, and you'll see the same thing. Men, do you realize that there's foul play afoot out on the retaining wall? We've got to go out there in time to stop anything more happening. Now, you've got your shoes on; grab the rest of your clothing and hustle it on as we make for the beach. Come along!"

Tom fairly got behind the men and pushed them outside. They would have liked to complain, but they didn't. Some of them were larger and heavier than the chief engineer, but they knew quite well that, at sign of any trifling mutiny to-night, Reade would thrash them all.

"If any one is trying to blow up the wall, Mr. Reade, it's all your fault, anyway," ventured Evarts, as the little party started at a brisk walk for the beach. "When you've got a mixed crowd of men working for you, you shouldn't interfere too much with their amusements. Yet you would have the gamblers run out of camp just when our boys were getting ready to have some pleasant evenings."

"I'll run out any one else who attempts to bring disorderly doings into this camp," Tom retorted quietly.

"Then there'll be some more of your seawalls blown up," Evarts warned him gloomily.