Hawk and Fisher

Hawk and Fisher are a married couple in this fantasy series of novels by Simon R. Green. The couple works for the City Guard, which is a lot like a modern day police force. The series is set in a world that mixes Industrial Revolution, Renaissance, and Medieval elements. They are the only City Guards that are not corrupt, as they are in a world called Haven (which is a corrupt city-state); they have never looked the other way or taken a bribe. They deal with everything, from destructive magic to pickpockets.