At 22, Kate had a passionate affair with Callum, a married man 17 years her senior. The relationship ended in heartbreak, and Kate believed she had moved on. Seventeen years later, Kate is a successful actress, married to Matt, and mother to Tallulah. Callum and his wife, Belinda, have rebuilt their life together in Edinburgh. However, when Kate and Callum cross paths again, old feelings resurface, leading them to confront their past and the choices they've made .