Joe O'Brien is a 44-year-old Boston police officer from the Irish Catholic neighborhood of Charlestown, Massachusetts. A devoted husband, a proud father of four children in their 20s, and a respected, seasoned law enforcement officer, Joe begins experiencing bouts of disorganized thinking, uncharacteristic temper outbursts, and strange, involuntary movements.

From the award-winning New York Times best-selling author of Still Alice and Left Neglected, comes a heartfelt novel about an accidental friendship that gives a grieving mother a priceless gift: the ability to understand the thoughts of her eight-year-old autistic son and make sense of his brief life. Two women, each cast adrift by unforseen events in their lives, meet by accident on a Nantucket beach and are drawn into a friendship.

Dolly Jamieson is not homeless, she's merely between permanent abodes. The 78-year-old spends her days keeping warm at the local library, where she enjoys sparring with the officious head librarian and helping herself to the free morning tea. It's not so bad, really. But it's certainly a far cry from the 1960s, when this humble girl from Geelong became an international star of the stage. As the acclaimed lead in the Broadway production of The Rose of France, all Dolly's dreams had come true. So how, in her old age, did she end up here?

Sarah Nickerson is like any other career-driven supermom in Welmont, the affluent Boston suburb where she leads a hectic but charmed life with her husband Bob, faithful nanny, and three children—Lucy, Charlie, and nine-month-old Linus.

Birdy thought she would have to wait until she was free again to see Rose, but now Rose has been convicted of a shocking crime and she and Birdy will be together. Birdy has been saving all her anger for Rose. It is Rose who should have protected her and kept her safe. Birdy was little but Rose was big, and she knows Rose could have saved her. This is a story about monsters who hide in plain sight and about the secrets we keep from ourselves. It is about children who are betrayed and adults who fail them.