The coastal town of Bristol Cove is known for its legend of once being home to mermaids. When the arrival of a mysterious girl proves this folklore all too true, the battle between man and sea takes a very vicious turn as these predatory beings return to reclaim their right to the ocean.

Samantha, a freelance photographer, is returning to Cape Cod for the first time since the death of her mother years earlier. She’s going to celebrate her father’s Christmas Eve wedding but is anxious to revisit past memories. On a deadline for a big Christmas spread that could ignite her career, she enlists the help of her childhood friend, Mike, to show her around. In the time she spends in Cape Cod, she realizes that Christmas is wherever your family is.