Gruesome horror set on the London Underground. Unable to find a taxi, Kate (Franka Potente) heads for the Underground and waits for the last train. She falls asleep and when she wakes, everyone has gone. She panics until another train pulls in. She gets on the train, unnerved that she's the only passenger but relieved to be on her way. Halfway through the tunnel the train jerks to a violent halt. The lights shut off and the train is plunged into darkness. Kate is trapped, in the dark and she is not alone.