A recently divorced mother, Lucy, and her two sons, Michael and Sam, relocate to the small coastal California town of Santa Carla to start anew, living with her quirky father. Known as the murder capital of the world, Santa Carla has an underlying darkness to it. Upon arrival, the two brothers quickly find themselves entwined with two very different groups: Michael falls for the mysterious Star and becomes involved with a dangerous local biker gang that holds a dark secret, while Sam befriends the eccentric Frog brothers, self-proclaimed vampire hunters who believe Santa Carla is plagued by the undead.

As Michael gets drawn deeper into the biker gang's activities, he begins to undergo a disturbing change in behavior, prompting Sam and the Frog brothers to investigate. Meanwhile, their mother, Lucy, starts a budding romance with a local store owner, oblivious to the supernatural dangers her sons are facing. Sam must confront the possibility that Michael might be turning into a vampire and that the town's youth are in peril. The brothers uncover unsettling truths about Santa Carla's nocturnal residents, leading to a confrontation where they must protect their family and put an end to the growing menace.