Construction worker and keen amateur footballer Nick Cameron (Robert Carlyle) has the best of everything when he meets and moves in with soulmate Karen (Juliet Aubrey). But complications arise when symptoms of a mysterious illness including numbness and double vision begin to sap his energy. As MS sets in, his physical powers quickly diminish and he loses his job, his sport and his sexual drive. Eroded by frustration, anger and self-pity, Nick lashes out at Karen, even accusing her of sleeping with her boss. At his lowest ebb, summoning vestiges of pride and self-sacrifice, Nick urges Karen to leave him. Will she accept an easy escape from his despondency and rancour, or stand by this frail shell of the man she fell in love with?