With no obvious connection between them, two men awaken to find themselves chained to the plumbing at opposite ends of a room. "Adam" (Leigh Whannell) is a photographer, the other is "Lawrence" (Cary Elwes), a doctor. Each have a micro-tape in their pocket and the only tape player in the room is nestled neatly in the hands of a corpse situated on the centre of the floor. A bit of ingenuity is needed to obtain the kit to play the tape and hopefully get some clue as to why there are there. Suffice to say that they do not like what they hear, and with the clock ticking they will have to learn to ...