"Shiver me!" muttered Dick. "I guess we've reached the vaults, matey."
"They wouldn't have a door like this to a bank vault, Dick. We'll go in and see if there isn't a door on the other side that we can open."
Matt entered the room, groping his way through the thick gloom. Dick followed him closely.
Suddenly, the door through which they had just come slammed shut and a key was heard grating in the lock.
"Trapped!" muttered Dick. "There was some one here and laying for us."
"Quick!" called Matt, whirling around. "Try the door."
Before Dick could get back to it, Matt heard a muttered exclamation and the sound of a struggle. It was impossible to see a thing, and the young motorist could only guess at what had happened.
"Dick!" he called, leaping forward.
"Look alive, mate!" panted Dick. "Some one's got hold of me."
Before Dick had fairly finished speaking, a pair of stout arms went around Matt, and he was forced to fight on his own account and leave Dick to look after himself.