Thus directed, and admonished, Larry managed to give the airplane a swinging, zig-zag course, so that its greater speed was used up in the longer legs of its slanted progress, and since the hydroplane did not try any tricks or change its path, the Sound was being crossed in the wake of the steamer by the boat and in a corkscrew path by its aerial bloodhound.

“I think I know what is going to happen,” Sandy decided, as they crossed the course of the hydroplane so that its two tiny colored beams showed at the same instant. “He’ll wait till we get closer in to the Connecticut shore line and then he’ll ‘douse the glim’ and leave us with nothing to watch.”

Bending forward Dick began to rummage in a compartment built in his section of the seating space.

He believed that he could outwit any effort to escape by taking advantage of the landing flares, attached to small parachutes, which Jeff carried as a precaution during his former night hops to the old estate.

“Better cut the gun and glide down a couple of hundred feet,” Larry heard Jeff’s voice in his earphones. “If he tries any tricks——”

“That’s queer!” Sandy exclaimed to himself, as he stared down and saw the small, swift boat open a vivid, glowing eye at the bow.

The helmsman had switched on its searchlight.

“What’s that for?” Dick wondered.

Jeff, warned by the trail of light on the water below, took a quick look.

“He must be looking for his landing!” Sandy called.