Boston 1968. Rose Moroney is seventeen, smart, spirited – and pregnant. She wants to marry her boyfriend. Her ambitious parents have other plans. She is sent to Ireland, their birthplace, to deliver her daughter in a Mother and Baby home. Against Rose's will, her baby is taken for adoption.

Dublin 2013. Martha Sheeran’s life has come undone. Her marriage is over, and her husband has moved on with unsettling speed. Under pressure from her teenage daughter, she starts looking for the woman who gave her up for adoption more than forty years before.

Martha's search for her birth mother leads her to the heart of long-buried family secrets and forces her to question everything she thought she knew. When her first love, Paudie Carmody, re-enters the frame, she's also forced to take a hard look at her own life.

From Boston to rural Ireland; from Dublin back to Boston, The American Girl is a heart-warming and enthralling story about mothers and daughters, love and cruelty and, ultimately, the struggle for acceptance – and the embrace of new horizons.