Ten years ago, an impossible thing happened: a flock of pigeons picked up a human squab who had been abandoned in an empty lot and carried her, bundled in blankets, to their roof. Coo has grown up with that story; she has lived her whole life on a rooftop with the pigeons who saved her. But what Coo doesn’t know is what her life was like before. Or why she can’t fly. When a hungry hawk nearly kills Burr, the pigeon she loves most, Coo is forced to brave a perilous trip to the ground for the first time ever to contact Tully, a retired postal worker who feeds Coo’s flock and has a knack for healing wounded birds. Tully not only heals Burr’s broken wing, but she coaxes Coo from her isolated life with the birds. Living with Tully, Coo experiences warmth, safety, and human relationships for the first time. But just as Coo is beginning to blossom, she learns that the human world is infinitely more complex—and cruel—than she imagined. Will Coo be able to save the birds and keep the family she’s finally found?