A group of friends from Boston who feel stuck in life experience an unexpected wake-up call after one of their friends dies unexpectedly.

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.

When a young boy accidentally triggers the universe's most lethal hunters' return to Earth, only a ragtag crew of ex-soldiers and a disgruntled scientist can prevent the end of the human race.

Tragedy strikes when a woman named Joyce's son falls through the ice on a frozen lake and is trapped underwater for over 15 minutes. After being rushed to the hospital, the 14-year-old boy continues to fight for his life as Joyce, her husband and their pastor stay by his bedside and pray for a miracle.