Leviticus

Following his father's death, Naim Reid and his mother Arlene relocate to a devout evangelical Christian town in Victoria. There, Naim meets and begins a secret romance with local teenager Ryan Whelan. After witnessing Ryan kissing the pastor's son, Hunter, a jealous Naim vengefully outs Ryan and Hunter to the latter's parents.

Hunter's parents enlist a "deliverance healer" to purge the boys of their homosexual desires. Ryan and Hunter uncontrollably convulse, vomit, and scream in agony throughout the ritual. Naim later attempts to make amends with an increasingly withdrawn Ryan, who rebuffs him. Naim witnesses Ryan talking to empty air, then follows him to a local roller rink, where photo booth pictures are printed of Ryan kissing an invisible figure. Naim opens the curtain to see Ryan being strangled by an unseen force. Ryan escapes and screams at Naim to stay away from him.

Naim seeks out Hunter, and witnesses him being attacked and dragged away by another invisible force. Hunter's decapitated head is later discovered in a nearby field. Terrified for Ryan's fate, Naim approaches the police, divulging their relationship to a detective and pleading with her to stop the entity. She dismisses him and informs Arlene about his relationship with Ryan.

Hoping to protect Naim from hatred and persecution, Arlene hires the healer to perform the ritual on him. At Hunter's wake, Naim confronts Ryan outside. The two kiss before "Ryan" begins violently attacking Naim. Naim returns to the house and sees Ryan inside, whereupon he realizes he was not being attacked by the real Ryan. Hunter's sister, Izzie, tells them that a girl named Marnie in a nearby town died under mysterious circumstances after she and her girlfriend Jessica were subjected to the ritual.

Naim and Ryan visit Jessica at a hospital. She explains that the entity takes the form of the person its victim desires most, only appears when the victim is alone, and grows stronger over time, and that there is no way to stop it. On the bus ride home, Ryan and Naim kiss, and Ryan gives Naim a handjob. Desperate to protect them both, Naim informs Ryan that he plans to leave town and begs him not to follow. Ryan confesses that if the entity will follow them forever, he doesn't want it to appear as anyone else but Naim.

The entity attacks Ryan in the school bathroom, mutilating his ear. Blaming Ryan and Naim for her brother's death and her father's subsequent abandonment of the family, Izzie lures them to an abandoned car park under the pretense of helping them locate the healer. A group of teens who have been bullying Ryan then arrive to assault them. Izzie reveals that Naim was the one who outed Hunter and Ryan. Ryan fights off the attackers and helps Naim escape, before furiously asserting that he never wants to see him again.

While Naim is home alone, the entity attempts to break into the house. Ryan arrives at Naim's back door, seemingly also running from the entity. The two reconcile before "Ryan," actually the entity, breaks through the screen door and attacks Naim. Naim manages to ward off the entity with a lighter. The entity chases him to a derelict mill, which Naim sets ablaze with the entity trapped inside.

When Ryan disappears soon after, Naim fears he may have mistakenly killed the real Ryan. Authorities later confirm that no trace of Ryan was found in the ruins of the mill. Arlene admits that she knew the consequences of the ritual, but insists that she did what was necessary for his survival. Hurt and betrayed, Naim abandons Arlene at a gas station and heads to a nearby bus stop to leave town. He finds Ryan, who also intends to leave, and the two board the bus together. As it drives away, Naim glimpses the entity outside, but chooses to ignore it.