Matthew Reilly is a lonely priest haunted by secrets. Young Alison is the shy and devoted keeper of Daisy, a falcon that suffered an accident and can no longer fly. When they meet in a Boston parish, Matt tells Alison about the day a decade ago when he missed the plane out of Logan Airport that tore into one of the Twin Towers. What he hasn't told her is that among the victims was a son that no one knew he'd fathered. With no confidantes and close to exhaustion, Matt suffers a heart attack, forcing him to reflect on what's become of his life. He recalls a teaching stint in Toronto a year earlier, his encounter with Gavin, a troubled and predatory man, and his discovery that his son had a male partner who had perished with him. He remembers returning to Boston, only to be perplexed by Alison and the affection that she and her beloved falcon draw from the homeless people who live on the Boston Common, but Matt has forgotten a momentary but fateful encounter with Alison eight years earlier in Toronto and it's only when her falcon frightens a child in the parish that even Alison begins to recall her terrifying ordeal years ago as a homeless person in Toronto.