The Rover Boys Under Canvas; Or, The Mystery of the Wrecked Submarine #966038

A seemingly peaceful summer camping trip explodes into a pulse-pounding mystery when a damaged, experimental submersible washes ashore. The inquisitive brothers quickly find themselves entangled in a web of espionage, racing to uncover the secrets of the advanced vessel before shadowy foreign agents can silence them. Dodging unseen enemies and solving complex mechanical riddles, they plunge into a dangerous game of cat and mouse. Their courage and ingenuity are the only things standing between a revolutionary invention and the wrong hands.