Ten-year-old Becky, her little sister Nicky, and their parents are on a dream vacation cruise in the Caribbean when the two girls disappear from the ship. Both parents claim to know what happened to their children, and they blame each other for kidnapping them. FBI profiler Eva Rae Thomas is flown in to assist in finding the girls. As the search continues, no passengers are allowed to leave the ship and tensions rise. When one of the girls is found dead, Eva Rae has to deal with finding a killer onboard.