When Don and Jim Mercer and their buddy Terry Mackson set out in their
sloop, Lassie, for a visit to Mystery Island, they were in search of adventure and fun. But they quickly found they were
getting more than they bargained for –– real danger, a skirmish with marine bandits, and a fight for their lives. This is a thrilling
adventure story of three modern boys –– with action and excitement on every page.
