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In this entry in the long-running series, The Bowery Boys must help their leader after he becomes hypnotized by an unscrupulous mesmerizer who sends him back in time to the swashbuckling days of Blackbeard the pirate. There he is to find a buried treasure. The lad finds it, but upon awakening, he finds the hypnotist holding a gun on him. The crook then escapes to find the loot. Fortunately the other boys beat him to it. At the location, they learn that the treasure is really the hidden loot from an old theft of a jewelry store. The honest boys hand the crook, and the treasure over to the police.