When an unidentified woman is found brutally murdered, Detective Molly McGee teams up with fellow cop, Alex O'Connell-with whom she shares a tragic past-to solve the crime.

In the mermaid-obsessed sea town of Bristol Cove, everyone's lives will change when actual mermaids come ashore, causing sides to be taken, loyalties to be tested and a war between man and mermaid to begin.

The show follows the life of a criminal family as they smuggle drugs into Australia and exotic wildlife out through blood ties in the Torres Strait Islands.