A group of teenage girls, led by Courtney, the sister of a survivor from a previous killing spree, plans to spend the weekend at a condo for a fun slumber party. Courtney, haunted by nightmares of her sister’s experience, tries to focus on her burgeoning music career and the excitement of the getaway with her bandmates and friends. As the girls settle in, Courtney’s dreams intensify, featuring a sinister rockabilly musician with a deadly guitar drill. Meanwhile, the girls engage in typical slumber party activities, unaware of the darkness inching closer to their festivities.

The fun takes a turn as Courtney's visions grow more disturbing, blending her fears and reality. The mysterious, guitar-wielding stranger from her dreams starts making appearances, stoking her paranoia, as she grapples with the trauma linked to the violence from her past. Her friends remain oblivious to the gravity of Courtney's distress, chalking up her worries to overactive imagination and teenage angst. As the night progresses, the line between hallucination and actual threat blurs, with the girls’ sense of security, and their lives, hanging in the balance.