Perhaps they lack the subtlety of other groups, but the Candles of God have no desire to be subtle. Perhaps they do not keep their secrets very well, but the Candles of God want their voices to be heard. Perhaps they are careless about who they kill, but there shall be no innocent bystanders when the fires of hell consume the unrighteous.
In the harbour of a major city a large and terrifying ship made of human nails docks. Nobody seems to inhabit this ominous vessel, someone needs to go on board and unveil the mystery. In comes the PCs.