Auror training was not supposed to be like this. Harry, Hermione, and Luna are sent to investigate Newin College, a guild of powerful wizards with too many secrets. Prologue takes place in the 1960's. Main body of story begins about a year after Deathly Hallows.

Picking up immediately after the ending of Let Me In, this novel follows the struggles and joys of Abby and Owen as they attempt to survive Abby's condition and the pursuit of a relentless FBI agent.

Prequel to Let Me In and Let Me In 2. Abby and Constance enter Atlanta in 1887. Constance catches a vision of a better life, leading Abby to take up an impossible quest. "Two known nothings can produce an undefined something. That's what we will be. Abby divided by Constance: indeterminate."