They have been close friends for almost two decades, supporting each other through personal and professional crises - parents dying, children leaving home, house moves, job changes, political activism, diets and really bad haircuts. Now the gang of four', Isabel, Sally, Robin and Grace, are all fifty-something, successful and restless. It is Isabel who makes the first move, taking a year away from her family to follow in her mother's footsteps across Europe. Soon Sally is on her way to San Francisco, to come face to face with a guilty secret. Robin, in the wake of a clandestine relationship, heads for isolation in the country. And Grace? Well, Grace would never go away for an entire year, but, lonely in the others' absence, she thinks she might take a short holiday in England. Once there, she bumps into someone she hardly knows - herself.