Having solved the matter of the Radiant Boy, Riley, Buttercup, and Bodhi are enjoying a well-deserved vacation. When Riley comes across a vicious black dog, against Bodhi’s advice, she decides to cross him over. While following the dog, she runs into a young ghost named Rebecca. Despite Rebecca’s sweet appearance, Riley soon learns she’s not at all what she seems.

As the daughter of a former plantation owner, Rebecca is furious about being murdered during a slave revolt in 1733. Mired in her own anger, Rebecca is lashing out by keeping the ghosts who died along with her trapped in their worst memories. Can Riley help Rebecca forgive and forget without losing herself to her own nightmarish memories?

In the class of the high school English teacher she has been haunting, Helen feels them: for the first time in 130 years, human eyes are looking at her. They belong to a boy, a boy who has not seemed remarkable until now. And Helen—terrified, but intrigued—is drawn to him.

The fact that he is in a body and she is not presents this unlikely couple with their first challenge. But as the lovers struggle to find a way to be together, they begin to discover the secrets of their former lives and of the young people they come to possess.