Legend has it that the pacific northwest town of Bristol Cove was once home to mermaids.

Now, this coastal town has a mysterious new visitor in a girl named Ryn (Eline Powell), who may just prove that all of the stories are true. Ryn catches the eye of local marine biologist Ben Pownall (Alex Roe), and when he begins to show interest, fellow marine biologist Maddie Bishop (Fola Evans-Akingbola) becomes suspicious. Others in town, like deep sea fisherman Xander Mcclure (Ian Verdun), are on a quest to discover the truth that is out there, and Helen Hawkins (Rena Owen), the town eccentric, knows more about the mysterious creatures than she lets on.

The battle between man and sea takes a dangerous route as these predators seek to claim their birth right.