When Frankie stumbles upon an unopened letter from her late mother, she's delighted to have one last message from her, until she reads the contents and discovers the truth about her birth. Brimming with questions, she travels to York to seek further answers from the Mortimer family, but her appearance sends shockwaves through them all. Meanwhile, Robyn Mortimer has problems of her own. Her husband John has become distant, and a chance remark from a friend leads Robyn to wonder exactly what he's not been saying. Dare she find out more? As for Bunny, she fell head over heels in love with Dave Mortimer when she first arrived in town, but now it seems her past is catching up with her. She can't help wondering if he'll still feel the same way about her if he discovers who she really is and what she did. As secrets tumble out and loyalties are tested, the Mortimers have to face up to some difficult decisions. With love, betrayal and dramatic revelations in the mix, this is one summer they'll never forget.