Abigail Gibson is gone. The morning after Christmas Day, she walks out of her home in the leafy suburbs of Westchester, New York, leaving behind a strange note on the kitchen table... and her ten-year-old son, Sam.

When her sister Gillian gets the call, she can barely believe it. Abigail has always been a little, well, unreliable, but she hasn't done anything like this in a decade--not since Sam was born.

Now Gillian's left taking care of Sam while she waits for news of Abigail's whereabouts. But things aren't so great in Gillian's home either, where her husband's odd behavior and late-night work schedule is putting their marriage under increasing strain. Meanwhile as Abigail's absence becomes ever more mysterious, Gillian must confront the two questions whose answers will soon upend her world: what was it that made Abigail leave... and is she ever coming back?

From the bestselling author of The Silent Daughter and The First Wife's Secret comes this gripping new novel about buried pasts, old secrets, and the risky choices we make for love.