What happens when the cops have to deal with supernatural baddies? What if the cops are supernatural creatures themselves? It makes for really great fiction, that's what.
If you liked seeing Nick figure out the supernatural world while solving crimes, you like urban fantasy. Like whoa. If you liked the whole supporting cast like Rosalie and Monroe and Trouble? Oh, are there so many books you should read.
What to read to fill the Grimm void: In Kim Harrison's The Hollows series, heroine (and witch) Rachel Morgan goes from working for the police investigating issues with the vampires, shifters, faeries, and every other supernatural creature to running a PI firm with a vampire best friend Ivy and getting a lot of help from a creatively foul-mouthed pixie who lives in her backyard. Don't panic about keeping up with all the supernatural creatures — they'll be old friends before you know it. If you like the balance of humor and dark crimes found in Grimm, The Hollows is up your alley. There are 14 books in this series, so start with Dead Witch Walking.
Too daunting? Try Ben Aaronovitch's Midnight Riot instead.
