After a year spent in Canada, Cathy Maitland returns to England to be bridesmaid at the wedding of her old school friend, Ruth. The best man having slipped a disc, Ruth's elder brother Joss is persuaded to take his place. That evening, when Cathy and Joss meet after the reception, they find that instead of their former indifference, each experiences a new and overwhelming attraction to the other. But when they end up working together in St. Martha's Hospital Accident Unit, things just don't work out as expected.