London is in chaos. A military cargo plane has crashed leaving its highly classified contents strewn across the city. Completely unaware London is in lockdown, Charlie (Noel Clarke) and Shelley (Antonia Campbell–Hughes), accompanied by best friends Mark (Colin O‘Donoghue) and Nikki (Laura Haddock), are at Storage 24 dividing up their possessions after a recent break–up.

Suddenly, the power goes off. Trapped in a dark maze of endless corridors, a mystery predator is hunting them one by one. In a place designed to keep things in, how do you get out?