Claudia (Amber Tamblyn) is in a hurry to return to the hospital bedside of her dying grand-mother. Tommy is a young punk on his way to elope with his girlfriend. Karl (Aiden Gillen) has guilty secrets that must be erased from his apartment before his wife and daughter get there. But all three are trapped in an elevator in a deserted building on holiday weekend - and are desperate to get out.
What first seems an inconvenience soon turns into a nightmare when no one answers their calls, their meagre water supply runs out and one of them goes just a little bit crazy under the pressure. Propelled by escalating tension and an increasingly desperate conflict, Blackout hurtles towards a terrifying climax.