Working for the Devil

Necromancer Dante Valentine gets drafted by the literal Devil to hunt a rogue demon, with fallen angel Japhrimel as her reluctant bodyguard. This is urban fantasy first, romance a distant second - the attraction between Dante and Jaf simmers under layers of supernatural politics and nonstop action. Saintcrow writes fight scenes like poetry and Dante is one of the most memorably prickly heroines in the genre. The worldbuilding - a future where psionics are licensed and demons broker in human souls - is richly detailed and deeply weird. Fair warning: the ending is dark and the romance takes a problematic turn regarding consent. Not a comfort read, but absolutely a compelling one.