First Frost has touched Cape Fen, and that means Baron Dire has returned. For as long as anyone can remember, Baron Dire has haunted the town come winter, striking magical bargains and demanding unjust payment in return. The Serling sisters know better than to bargain, lest they find themselves hunted by the Baron’s companion, the Wolf.

Then the Wolf attacks Eliza’s sister Winnie. They manage to escape, but they know the Wolf will be back, because the Wolf only attacks those who owe the Baron Dire. Winnie would never bargain, so that must mean that someone has struck a deal with Winnie as the price.

Eliza embarks on a journey to save her sister, but as she untangles the links between Baron Dire, the Wolf, and her family, she discovers a complicated web of bargains that cross all of Cape Fen. If Eliza can learn the truth, she might be able to protect her sister, but the truth behind the bargain could put her own life in danger.