When Peter Brisco returns to London to attend his brother's wedding, he renews his relationship with the love of his life, Katy Adair. They have not seen each other for ten years, but the attraction is instantaneous. Having decided to run away together, he is devastated when she is killed in an accident crossing the street. Coping to deal with his grief, he is directed to Life Line, a chat room for people who have recently lost someone. Kicked off the chat line for revealing personal details, he meets Catt, who suffered a similar fate. But just who was he talking to at Life Line and just who is Catt and where has she come from?