On a perfect July evening in the sizzling Irish summer of 1976, fifteen-year-old Festival Queen Lilly Brennan disappears. Thirty-seven years later, as the anniversary of Lilly's disappearance approaches, her sister Jacqueline returns to their childhood home in Blackberry Lane. There she stumbles upon something that reopens the mystery, setting her on a search for the truth - a search that leads her to surprising places and challenging encounters.