"There are snakes in this town, and I'm not just talking about the people."
Viperville is an unusual town in many ways. Places have a tendency to disappear and reappear at will, some people live forever, and the mayor has been missing for twelve years. Caia and Zeb, amateur private eyes, make their livings on solving people's odd conundrums. They like to think they've seen it all.
When giant, bloodthirsty, human-eating snakes begin to roam the streets of Viperville, Caia and Zeb find themselves far beyond their depth and embroiled in a fight to save their town.
In the epic conclusion to the Devil's Deal series, Freya has one final chance to discover the full potential of her own power, and to use it to restore balance in the universe - once and for all. After the destruction caused by Roisin, Ferya and Torix come to terms with their losses and mistakes... And prepare for a final battle that will change everything.