Whooping Hollow bully, Bryce Billings, dares Fish Finelli and his friends to enter the one-legged whaler's long-abandoned haunted house on the night of a full moon. As they prepare for entry, they discover that if an heir to the house doesn't come forward by the end of the week, Bryce's dad will tear it down to build a resort. Determined not to let this historic (if ghost-infested!) house be destroyed, Fish and his friends decode a secret message, explore a hidden tunnel and tail a newcomer to town to determine if there really is an heir. 

When Bryce Billings says he will clobber Fish Finelli in the Captain Kidd Classic boat race, Fish has no choice but to accept the bet. But Fish's 1970s Whaler with a broken motor is no match for Bryce's new, top-of-the-line, 9.9-horsepower Viper. Even if Fish, Roger and T. J. can fix the measly 5-horsepower motor, it can't compete with Bryce's boat. With $9.63 between them, do the guys even have a chance of beating Bryce at the Classic?

When bully Bryce Billings bets Fish Finelli that he can’t find Captain Kidd’s legendary long-lost treasure, Fish and his friends embark on a quest to find real-life pirate treasure. Between sneaking into the library to track down Captain Kidd’s map, stowing away on a boat and trespassing on an island, Fish and his friends have their work cut out for them. But will Fish actually be able to find Captain Kidd’s booty and win the bet?