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.
In the late 1990s, a family of six settles into their new home on Vancouver Island, as internal dynamics are slowly revealed through the experiences of the youngest child, Sasha. Their fresh start is interrupted by the increasingly dangerous behavior of Jeremy, the family's oldest child.
