Long Fin Silver (Shark School, Bk. 9)

Harry Hammer can't believe his luck! He and his family are going on vacation to Treasure Reef, home of the lost treasure of that meaner-than-mean, long-ago pirate Long Fin Silver. Legend has it that he buried the Black Blood Pearl, the most valuable and beautiful gem in the history of the ocean. Harry and his pesky cousin, Harvey, are on the hunt for treasure. But they best be careful where they look, as they're about to come fin-to-fin with the spooky spirit of Long Fin Silver himself!