In Luna Bay, California, Chris Emerson, a young former surfing prodigy, and his younger sister Nicole Emerson move into a house owned by their aunt Aunt Jillian after the death of their parents. Chris leaves his address at the town’s surfboard shaper, Edgar Frog, hoping to land a job and a steady connection in the community. That same evening, former pro surfer Shane Powers spots them and invites them to a party that will change everything.
At the party, Shane and his circle—Kyle, Erik, and Jon—liven up the room as Chris and Nicole mingle with the guests. Chris shares a private moment with a girl named Lisa, while Shane corners Nicole, weaving a conversation that leads to her drinking his blood. When Chris learns what Nicole has done, he returns her home, where she begins to show unusual strength and a surge of anger. Before she can harm him, Edgar arrives and reveals a frightening truth: Nicole has been infected with vampirism, and Edgar is a hunter who has dedicated himself to stopping creatures like Shane. Chris, furious and protective, throws Edgar out.
The night shifts from warning signs to deadly danger when Lisa reappears, engaging Chris in conversation before she makes a crude attempt to feed on him. He fights back and, in a shocking accident, impales her on a mounted rack of antlers, causing her petrified form to explode. With Nicole’s condition now clear and terrifying, Chris reluctantly accepts Edgar’s help. Edgar explains that Nicole is only half-vampire; she can be returned to humanity if the head vampire is killed, but the path to that outcome will be perilous.
Nicole’s transformation becomes even more personal when Shane targets 22-year-old Evan Monroe, a kind suitor who has begun courting her. Nicole, convinced she is a vegetarian, almost feeds on Evan, only to be stopped at the last moment by Chris. This crisis shakes her, but it also hardens the resolve of everyone involved. Undeterred, Shane lures Nicole back to their vampire lair, and the two engage in a brutal and intimate exchange that underscores the depth of their tangled relationship.
Seeking a way to strike at the source, Chris and Edgar decide that Chris should “join” the vampire tribe long enough to learn the lair’s location. He consumes Shane’s blood and starts to manifest vampiric traits, though he remains morally opposed to the bloodthirsty ways around him. When the tribe hunts a group of girls for sustenance, Chris refuses to join in the slaughter and instead kills Erik by driving a drill through him. Edgar joins Chris’s side, and together they press into the lair, where they confront Kyle and other threats. In a tense confrontation, Chris impales Erik with a heavy drill, and Edgar destroys Kyle by causing his head to explode with a holy-water balloon.
Meanwhile, Shane tries to coax Nicole into killing Evan, who remains bound and gagged for her. With Chris’s help, Nicole resists and ultimately turns away from the plan to harm Evan. The two lovers fight their way back, and Shane’s appetites push him toward a desperate choice. The climactic moment comes when Nicole drives a stake into Shane, and as he lunges to drag her with him, Chris arrives wielding a sword and decapitates Shane, breaking the spell that had corrupted them and returning them to normal.
Relieved and grateful, the pair thank Edgar, who nonchalantly reminds them that he’ll bill them for his services—a practical vampire hunter with a dry sense of humor. Evan, grateful to Nicole for her safety, asks her out on a date, signaling a chance for healing and normalcy after the nightmare. Their aunt returns home soon after, surprised to find them alive and insists they keep their nights clean and away from “drugs,” painting a stark contrast to the scare they’ve endured.
In a mid-credits moment, Edgar confronts Sam Emerson, now a vampire himself, and the two lock eyes in a tense standoff as credits resume, hinting at further battles to come between the living and the endlessly shifting world of the undead.
