Cinde and Steena and their cousins Clay and Lutie are off to Gulf Shores, Alabama to enjoy two weeks in the sun and sand before the new school year starts. Fresh off of solving the case of the haunted farmhouse, the Curious Cousins Club has only one thing in mind: fun at the beach in the water and waves with their parents and crazy Uncle Stef. Despite their carefree attitude, mysterious occurrences have a way of finding the CCC and, this time, they're in for double trouble. First, someone or something, a phantasmagorical menace, doesn't want them going into the beautiful, emerald waters of the Gulf. If that isn't enough, they also encounter a ghostly presence at the old Civil War fort protecting Mobile Bay. The curious cousins are determined to salvage their vacation in spite of the mortal danger they're facing from bloodthirsty sharks and historical haunts. As tensions mount, it seems unlikely that the CCC will be able to crack the case before their parents head back home early for safety's sake.
