From naughty children to rebellious teenagers, Rosie and Alex have stuck by each other through thick and thin But just as they're discovering the joys of teenage nights on the town and dating disasters, they're separated Alex's family moves from Dublin to America Rosie's lost without her best friend But on the eve of her departure to join Alex in Boston, Rosie gets news that will change her life forever - and keep her at home in Ireland Their magical connection sees them through the ups and downs of each other's lives but neither of them knows whether their friendship can really survive the years and miles - as well as new relationships