The Cold Case Kids -- Brogan, Brycen, Heather and their zombie friend, Angus -- are thrilled to be spending time at Camp Lighthouse on Chantry Island. Until a mysterious fog rolls in ... and the island is cut off. A ghost ship rises from Lake Huron. Decaying mariners shamble forth from their watery grave. And a cloaked figure emerges out of the fog in search of something long ago lost.