fronted by a sight that made them gasp for the moment.
In the great rocky chamber, they saw three large pleasure cars and a small truck, parked close by the clammy walls.
"The stolen autos!" breathed Joe.
There stood four of the missing cars, undamaged, in this secret cavern in the bluffs. They had been driven in along the tunnel from the beach. It was an ideal hiding place and as the entrance to the tunnel was doubtless well masked, the cars were as safe from discovery as though they had been driven into the ocean. At least, so the thieves probably thought.
"We've found them!" Frank exclaimed.
All the missing cars were not hidden here, but the boys judged that the rest were probably stored farther on. For the flashlight revealed a dark opening in the rock at the other end of the cavern, an opening to a tunnel that no doubt led to other caves farther on.
The Hardy boys knew that the Shore Road bluffs, in certain places, contained caves and passages, some of which had never been entered. Although like most Bayport boys, they had done a certain amount of exploring along the beach, they had never heard of the existence of this under-ground labyrinth. It seemed strange to them that so elaborate a series
