Chapter 1: Saturday Night

Monica, Shawn, Hayden, Charlie and Parker have been friends since childhood and have their own rock band, Subject to Change. When Parker has to move away, the band recruits Troy to take his place in the band. Things go great for a while, but after Troy arrives, Monica starts having weird dreams and visions. At a concert, Corpse of the Harlot, a Satanic band, involve members of Subject to Change in one of their rituals, and that's when things get really out of control for Monica, who discovers she's being stalked by a demon called the Incubus. She is then faced with the challlenge of destroying the demon, but she'll have to do it herself if she can't convince her bandmates to believe her.