Ayelet Waldman explores the terrible cost paid by imprisoned mothers and the vagaries of the California foster care system in this particularly poignant sixth Mommy-Track mystery. Sandra Lorgeree, serving a 15-month sentence for heroin possession, reluctantly relinquished her infant son Noah to temporary foster care. Now the foster family has vanished, taking Noah with them, and Sandra appeals for help from Juliet Appelbaum, an ex-public defender who splits her time between caring for her three children and working as a private investigator. The day after Juliet takes on the case, Sandra is killed in prison, in what Juliet is sure is not a coincidence.