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 – and Alex goes with them. For good.

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.