After meticulous planning and preparation, Lewis (Luke Evans) snatches Cathy (Kelly Reilly) off the busy streets and takes her to a remote luxury house, locking her away in a soundproofed room measuring 10 feet by 10 feet. His motive: to have Cathy confess to a dark secret that she is determined to keep hidden. But, Cathy has no intention of giving up so easily, and proves more than a match for her kidnapper.