Carter is a teacher in London. One night he steps out into an autumnal storm and, on the way to his car, the oncoming night engulfs him and transports him to another, more sinister world.
Almost immediately he senses he isn't alone. When he turns and sees a shadowy figure approaching, he launches himself at the stranger. He soon discovers that Paul, the handsome Australian man pinned beneath him, is in a similar state of disorientated bewilderment.
Together they begin to explore their surroundings, hoping and praying they can find a way back home. What they are about to encounter will send terror coursing through their veins.
Little do they know this is a mere taste of the nightmare to come. Will their growing feelings for each other survive what follows? Can they themselves survive?