Wealthy, popular Webber Academy senior, Caroline, permits her new friend and classmate Waverly, an autistic, gay, scholarship student, to attend the annual Masquerade Ball disguised as her; but the evening becomes a nightmare when there is a global blackout, and Waverly and her friends discover what the school's dean and top donors really have planned.

An autistic scholarship student at the prestigious Webber Academy in New York City, Waverly is getting by on tutoring gigs and the generosity of the school's dean. When Caroline, a tutoring student, asks Waverly to attend the school’s annual fundraising Masquerade disguised as her, Waverly jumps at the chance. It's a way for Waverly to be with her secret ex-girlfriend, Ash. Then Waverly stumbles into a secret meeting between the dean and the school's top donors— and witnesses a brutal murder. Meanwhile a global blackout puts the entire party on lockdown. Waverly, Ash, and her friends must navigate through a dizzying maze of freight elevators, secret passageways, and back rooms if they’re going to survive the night. And with technology wiped out all over the planet, what kind of world will they find waiting for them beyond the doors? -- adapted from jacket