This British drama was originally created for British television but was later released in the U.S. It is based on a true story and chronicles the struggles of Deric and Diana Longden, a happily married couple who try to cope with Diana's inexplicable degenerative disease which causes occasional paralysis of her extremities and periodic blackouts. The doctors have no clue as to what ails her. Their love sustains them, but finally Diana comes to grips with the fact that the illness may prove fatal. She decides that before she goes, they should find Deric a replacement.