A Demon's Deal (Chronicles of the Warlock)

Leaving Storms End behind, Alex and his companions approach his next assignment from Usus. In the mining city of Pevale, a demonic cult has taken root. A human mining settlement established under baron Philip De Leah, when the four come to the enclosed mountain town they find a city already well established in a cruel game of greed and control. Expecting a conspiracy as they seek the cult of Cupiditas, they will discover that the roots of corruption reach further than they ever thought possible.
Already searching out the city using her own means, Siera sees the chains that bind the populace in a very real sense. Coming across Alex in her search for the cause of these bindings, she finds a group of companions united in a shared purpose. Deciding to join together with these newly found allies, their quest pits them against the cult of the city as they seek to uncover the far reaching plot of this demon's deal.