When Kate was twenty-two, she had an intense and passionate affair with a married man, Callum, which ended in heartbreak Kate thought she’d never get over it Seventeen years later, life has moved on – Kate, now a successful actress, is living in London, married to Matt and mother to little Tallulah Meanwhile Callum and his wife Belinda are happy together, living in Edinburgh and watching their kids grow up The past, it would seem, is well and truly behind them all But then Kate meets Callum again And they are faced with a choice: to walk away from each other or to risk finding out what might have been