A stranger's death becomes an opportunity for a woman desperate to escape her own life. Emily witnesses a fatal car accident that claims the life of Rose, a young mother who seemingly had it all. Consumed by grief and envy for Rose's perfect life, Emily makes a drastic decision: she will assume Rose's identity. She steps into the void left by Rose, offering comfort to the grieving husband and a maternal presence to the young son. However, as Emily delves deeper into Rose's life, she uncovers dark secrets that suggest Rose's perfect facade hid a far more complex and dangerous reality.

The premise of a stranger assuming another's identity after a tragic accident sets up a tense psychological thriller. The narrative structure, as suggested by the description, likely focuses on Emily's internal state and her gradual uncovering of Rose's hidden life, promising a compelling exploration of obsession and deception. The inclusion of endorsements from authors like Marian Keyes and Claire Douglas indicates a reception that highlights the book's addictive quality and its intricate plotting. The story is positioned as a compulsive and twisty read, designed to keep readers engaged until the final reveal.