Emily has been looking for the same face in every crowd for more than a decade: her brother’s. She’ll do anything to find him, she just never expects that one day he will walk through the door of the London housing office where she works, homeless and in need of help.
 
Emily’s overjoyed to see Stephen—her older brother, her hero, the one who taught her to look for the flash of a bird’s wings and instilled in her a love and respect for nature’s wonders—and invites him to live with her. But the baggage of the day that tore them apart, more than fifteen years before, is heavy. As they attempt to rebuild their relationship, they embark on the birding adventure they’d always promised to take when they were just children running wild in the wetlands of Canvey Island. And so, amid the soft, familiar calls of the marsh birds, they must finally confront what happened that June day—and in all the days since—if they are to finally find their way home.