Rosie Cantrell has a past that even her husband knows nothing of. Born Samantha Ashby, she abandoned her old life when her twin sister was murdered and their trust fund was stolen. Journalist Frank Stokes knows Rosie's story, and, nearly ten years later, he intends to write a book about the sisters. Tracing Rosie, he visits Thursdale, the village where she now lives with Mike and their baby son, Noah. Compelled to reveal her past to Mike, Rosie tells him of the man she dated who later killed her sister—and who was subsequently killed while in prison awaiting trial. To this day, there is no sign of the two-million-pound trust fund. When Stokes goes missing, the police question Rosie and Mike—and when Stokes's body is found close to their cottage, they become persons of interest. Soon, the investigation uncovers even more secrets, and threatens to destroy both their marriage and their lives...