The Harker twins - Hermione and Harriet - were the closest and best of friends throughout their idyllic childhood. Now, though, they haven't spoken for fifteen years - they don't even know if the other's alive, thanks to a cataclysmic misunderstanding over a man. Now Harriet's living in Bath where she's just broken up with her husband and has begun to notice how very appealing her neighbour Jesse is - if only he didn't have a beautiful, pouting young girlfriend. Hermione's in Toronto, where she's facing life as a single mum, having just discovered that the father of her baby is married. As their lives get more complicated, Harriet and Hermione are on the cusp of finding each other again. But, though they don't know it, time is running out for one of them...