Parenthood behind her, her only daughter off to college, Hannah O'Connell should be enjoying the peace of an empty home, and time with her husband, Sam. But a miraculous arrival, an abandoned baby girl, comes into their lives -- a precious infant with the power to put the unspoken strains in their marriage into sharp focus. Clashing with Sam over caring for little Ellie, Hannah takes a chance on her lifelong wish for a home filled with the laughter and joys of children. Sam needs only to look at Hannah's garden -- where, years ago, she hoped to plant a lilac bush for each of her children still to be -- to know he cannot keep her love for Ellie from blooming. But will a shattering secret from Hannah's past push them to the breaking point? Hannah will risk everything on the hope that love is enough for them all.