Haven Ambrose, a trailblazing nautical archaeologist, has come to the sun-soaked village of Positano to investigate the mysterious shipwrecks along the Amalfi Coast. But Haven is hoping to find more than old artifacts beneath the azure waters; she is secretly on a quest to locate a trove of priceless gemstones her late father spotted on his final dive. Upon Haven’s arrival, strange maelstroms and misfortunes start plaguing the town. Is it nature, or something more sinister at work?   In 1821, Mari DeLuca and the women of her village practice the legendary art of stregheria , a magical ability to harness the power of the ocean. As their leader, Mari protects Positano with her witchcraft, but she has been plotting to run away with her lover, Holmes – a sailor aboard a merchant ship owned by the nefarious Mazza brothers, known for their greed and brutality. When the Mazzas learn about the women of Positano, they devise a plan to kidnap several of Mari’s f