London, present day - Nora has always been sensible and thrived in her career. Now her life is falling apart. Troubled by anxiety and nightmares, she finds herself drawn to the sweeping beaches of Tenby, that she visited just once when she was younger. Together with Kaitlin, a local girl, she rents a beautiful townhouse and starts settling into a new life, when she meets handsome Logan Parry from New Zealand. Wales, 1950s - teenager Chloe Samuels goes to Tenby every year for her summer holidays. She stays with relatives, and spends the long days on the beaches and haunting the picturesque town with a local boy she calls Llew, her 'best friend in all the world'. When she is 18, she sets her sights on a glamorous older boy who seems to offer everything she has always wanted. Then, on the night of her Big Date, Chloe realises that her heart still lies with Llew. But before she can tell him, a terrible accident occurs.