Years after a coal mining disaster, an executive from an energy conglomerate in London is sent to the South Wales valleys to examine the possibility of reopening the Heulog-Arch Colliery. Miles below ground and far from the city, something awaits him in the mine.

Laura Bowlby is a psychic who wants to visit her husband in Hong Kong. She is picked up by a chauffeur in a black sedan. Laura Bowlby says she does not like the color and would prefer a canary yellow one instead. This remark shocks the driver since the car was once canary yellow before a recent paint job. Inside the car, Laura begins to hear a woman's voice. The voice tells Laura about a passionate affair. Laura longs for such passion in her life because her husband James is quite unromantic and cold. After some research, Laura find the grave of the woman who has been talking to her. She looks at the gravestone and is unpleasantly surprised to see the initials of the dead woman and the initials of her own husband, James.