Successful artist Jonah Briggs is a man who has made mistakes. Aged just eighteen, he was sent to prison for two years, leaving his family shattered and his first love, Sally, to wait for his return. But at eighteen, two years seem like a lifetime, and some promises are hard to keep. When Jonah reappears in her life, Sally finds herself torn between him and Ewan, the young Cornish farmer she has married, divided between loyalty and passion, duty and love. Over the course of almost two decades, through meetings and partings, secrets and revelations, and two momentous summers, Jonah will have to confront his past and heal old wounds, while Sally will face the consequences of her choices - whether to follow her conscience or her heart.