Due to menacing circumstances at home, Charlie Stephens accepts the position of summer camp counselor at the Seaview Harbor Aquarium. Visiting Stephens Point Lighthouse museum near the aquarium, Charlie’s new friend, Darren, introduces Charlie to the journal of McFarland Ross. McFarland’s journal reveals a 250-year-old mystery involving marauding pirates, buried treasure, secret caves, and family histories. Meanwhile, the problems from home have followed Charlie to Seaview Harbor. Strange things start happening at the aquarium. Charlie and Darren recruit Alexandria and Emily to help them track down the culprits and to possibly uncover the lost treasure of Stephens Point Lighthouse.