The other daughter - Lisa Gardner

Twenty years ago, Melanie Stokes was abandoned in a Boston hospital, then adopted by a wealthy young couple. Gifted with loving parents, a doting brother, and an indulgent uncle, Melanie has always considered herself lucky. Until the first cryptic, threatening note arrives: "You Get What You Deserve."

Melanie has no memory of her life before the adoption. Now someone wants her to remember it all-even the darkest nightmare the Stokes family ever faced: the murder of their first daughter. As Melanie pursues every lead and chases every shadow in search of her real identity, two seemingly unrelated events from her past will come together in a dangerous explosion of truth.