Rachel Caine is a zoologist working in Nez Perce, Idaho, as part of a wolf recovery project. She spends her days, and often nights, tracking the every move of a wild wolf pack—their size, their behavior, their howl patterns. It is a fairly solitary existence, but Rachel is content.

When she receives a call from the wealthy and mysterious Earl of Annerdale, who is interested in reintroducing the grey wolf to northern England, Rachel agrees to a meeting. She is certain she wants no part of this project, but the Earl’s estate is close to the village where Rachel grew up, and where her aging mother now lives in a care facility. It has been far too long since Rachel has gone home, and so she returns to face the ghosts of her past.