Flames Over Frosthelm by Dave Dobson

Marten Mingenstern and Boog Eggstrom are provisional inspectors, fresh out of Inquisitor's Guild training. Assigned a mundane task tracking down stolen jewels, they instead uncover a mysterious cult set on destroying the city. They earn the enmity of a vicious noble, the Chief Inquisitor gets bought off and goes rogue, barbarians seize them, and they are sentenced to death. Twice. In a race against prophecy, they face terrible forces long buried.

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