On a sunny morning in March 1987, four-year-old Stephen Nelson welcomes his new baby sister, Emily. Holding her for the first time, he vows to love and protect her, and to keep her safe forever. Nearly thirty years later, the two have lost touch and Stephen is homeless. Emily, however, has never given up hope of finding her brother, and when he arrives at the council office where she works, her wish comes true. But they say you should be careful what you wish for -- and perhaps they're right, because there is a reason the two were estranged... As the two embark on a birding trip together, Emily is haunted by long-buried memories of a single June day, fifteen years earlier -- a day that changed everything. Will confronting the secrets that tore them apart finally enable Emily and Stephen to make their peace, not just with their shared past and each other, but also themselves?