After his girlfriend Merrins raped and murdered, Ig wakes up with horns growing from his temples. Ig finds that nobody is bothered with the horns. They easily speak their darkest thoughts to him. Igs friend Lee helps him for the case. A flash-back tells the past of friends Ig, Lee, Eric, Glenna, and Terry. Lee rescued Ig from drowning when he was doing a dare for a cherry bomb. Then Merrin moved in. She flirted at Ig with her cross necklace. Ig took the cross when it broke and fell off her. Lee repaired it, but Ig traded his cherry bomb for it and returned it to Merrin, starting their relationship. Another flash-back partially revisits the murder night. Ig arrived at a diner only to find Merrin sad. She told Ig to look for another girl, which Ig responded angrily to, suspecting she cheated on him. He left just as Terry arrived. At present, Ig confronted Terry about it. Through skin contact, Ig sees Terrys perspective of it. Terry drove Merrin home but she asked to get out of the car. He waited in the car and dozed off to sleep, waking up the next morning with bloodied hands. He took care to move his name out of suspicion.
Ig tells this to Lee, the only person unable to see his horns, only to find now he has Merrins cross on his neck. Ig finds snakes becoming his new pets, and that he can drive people to do some things. Suspecting Merrin cheated with Lee, Ig refuses anymore of Lees help and grabs Merrins cross off him. Lee then can see Igs horns. Ig forces the truth out of Lees mouth. Lee confesses to the murder. Ig learns the rest by touching Lee. That night Lee found Terry asleep. He went on and asked Merrin for her love. He killed her as she refused. At present, Lee assaults the stunned Ig, and douses him on fire in his car. But Ig drives away being ablaze. Lee tells people Ig confesses to the murder and committed suicide. Skin burned, Ig strangely survives the fire. He goes to Merrins father, who gives him Merrins last letter. The letter reveals the truth, that Merrin had cancer, thus she fended Ig off so Ig wouldnt have to share her pain. Ig miraculously recovered from burns when he wears Merrins cross. Ig confronts Lee, whos surprised Igs not dead. Terry and Eric also come. Terry already revealed the truth to Eric, now a cop. Eric points a gun at Lee. Tricking his way, Lee seizes the gun, killing Eric and wounding Terry. Under gun point Ig tears Merrins cross from his neck and transforms into a demon-like figure, which then kills Lee.
