When Lisa Martin and David Kirby were forced to part, they never dreamed they might one day have a second chance. Many years later, they meet again and realise that they are still the big love of each other's lives. Now, being in a position to marry, they don't waste any time. But then they are faced with a shocking truth and once it's upon them, there is nothing they can do to turn the clock back. However, David won't be defeated. When Lisa discovers what he intends she's so horrified that she can barely even discuss it. Yet, through a chink in her fear, she can see the logic of what he's suggesting. But can she bring herself to help him?