The voice on the other end of the line was soft, yet forthright: "Sarah, my name is Hannah Morgan. I think I'm your birth mother."

The phone call, wholly unexpected, instantly turned Sarah Saffian's world upside-down, threatening her sense of family, identity, self. Adopted as an infant twenty-three years before, living happily in New York, Sarah had been "found" by her biological parents despite her reluctance to embrace them.

In this searing, lyrical memoir, Sarah chronicles her painful journey from confusion and anger to acceptance and, finally, reunion--but not until three...