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.

One action. Just one act of kindness near the start of the school year by the PE teacher Rita Desjardin is all it takes to change the life of Carrie White, and the lives of everyone in Chamberlain Maine. See what many knew, but never bothered to react too, was that Carrie was locked out of her house for the whole weekend at least once a month by her mother. This time Rita finds out