A sea witch has been leaving bodies in her wake up and down the Carolina coast, baffling authorities who are finding drowning victims with no water in their lungs. The finicky female will continue to kill young male witches until she finds her perfect man - the one who survives her mating ritual - so she can live for another hundred years. And now coven hopeful Brian Fuller is about to be ensnared in her net. Retired witches Molly and Elsie, along with the ghost of Olivia and her daughter Dorothy, need all the help they can get to stop the sea witch. Aided by a selkie and a crßeme puff-craving mermaid, they're determined to keep Brian out of her murky clutches. But are they all about to get in over their heads?