A married couple rents a seaside Airbnb only to be surrounded by peculiar neighbors and occurrences. They soon discover to be in the grips of a mysterious cult and their ancient sea god. 

"After suffering an untimely loss, Alex (Gina La Piana) and her husband Petri (Johann Urb) visit California for a much-needed break from reality. At an unassuming rental, they meet the mysterious Russell Marsh (Robert Miano). Marsh introduces them to the oddly enthusiastic locals, fixes them a lavish meal and invites them out on his luxury boat.  Little do they know that beneath Mr. Marsh’s thin veneer of avuncular charm lurks a dark devotion to an archaic evil. A wickedly warped twist on the classic Cthulhu mythos, The Deep Ones is what it looks like when Rosemary’s Baby undergoes the Innsmouth Transformation." Read the full write-up on PopHorror.