In 1967, when ten-year-old Seth moves with his mother to an old house in a rural village deep in the Berkshires of western Massachusetts, the last thing he expects to find is friendship.
But someone is waiting for Seth in Hadley Falls. Lily is a girl his own age who seems to be mysteriously attached to the old house and who keeps herself hidden from everyone except Seth as she invents a new game to keep them together forever.
Set against the social turmoil of the Vietnam War years, Seth's story is a mesmerizing tale of secrecy and deception driven by the rules of a game that turns deadly.