For several minutes there followed a conversation carried on in a guttural undertone. The name “Irma” reached Ned Blake’s ears, also several disjointed phrases of which he could make nothing, except that they seemed to voice dissatisfaction with something or somebody. Once he caught the words “monkey business” followed by an expression of disgust. At length the owner of the growling voice was heard to climb aboard the truck.

“Look for us in a couple of hours,” was his parting word to the man who was already returning to his former place in the shanty, and then the vehicle moved away in the direction of Coleson’s.

Waiting until the scrape of the shanty door and the squeak of its hinges had assured them that its occupant was inside, the boys circled the building, seeking a crack through which they might catch a glimpse of him. The effort proved fruitless, for obedient to orders, he had cut off the light, and save for the faint glimmer above the smoke-pipe not a ray could be seen. Convinced at last that nothing was to be gained in this manner, the boys crept back to the doubtful shelter of the slab pile.

“That truck has gone out to Coleson’s and won’t be back for two hours,” chattered Dave, whose lanky frame was beginning to feel the ill effects of his thorough wetting. “I’d like to know what’s up,” he continued, “but I’ll say it’s a mighty damp way of finding out!”

“I wish we could have heard what those fellows were talking about,” remarked Ned, regretfully.

“All I could get was the name ‘Irma,’” grumbled Dave. “I suppose that means there’s a woman mixed up in this business—whatever it is.”

“I wonder,” mused Ned. “Maybe now—” he broke off suddenly.

“You wonder what!” grunted Dave unsympathetically. “‘Irma’ is a woman’s name, isn’t it?”

“I’ve got it!” exclaimed Ned eagerly. “‘Irma’ isn’t the name of a woman—not in this case anyhow—it’s the name of a boat! I saw her up at Cleveland last month. She’s an old steam-tug, and I’ll bet she’s the craft Dick and I saw come in close to Coleson’s beach last night!”

For a while the two discussed this possibility, but without arriving at any definite conclusion. Meanwhile, the wind had increased in force and the chilling rain was driving almost unchecked through the flimsy slab shelter. Grimly the boys stuck to their watching, and at last the gleam of a headlight brought them to their feet with a warming thrill of excitement.