Anna, a self-sufficient and reliable single mother, packs her bags one day for a short vacation to Italy. She leaves her beloved six-year-old daughter, Lily, at home in London with good friends. But when Anna doesn't return, everyone begins to make excuses until the likelihood that she might not come back becomes chillingly clear. And the people who thought they knew Anna best realize they don't know her at all. How could she leave her daughter? Why doesn't she call? Is she enjoying a romantic tryst with a secret lover? Or has she been abducted or even killed by a disturbed stranger?

Did that person you loved so much and thought you knew so well -- did they simply choose to go and not come back? Or did someone do the choosing for them?

Dunant, a masterly British suspense writer, skillfully interweaves parallel narratives that are stretched taut with tension even as they raise difficult questions about motherhood, friendship, and accountability. In this compelling hybrid of sophisticated crime writing and modern women's fiction, Dunant challenges and unnerves us as she redefines the boundaries of the psychological thriller.