I am a big fan of the series of books and graphic novels by Ben Aaronovitch, collectively named after the first book in series, Rivers of London (sometimes also called the Peter Grant series after the main protagonist). For those not familiar, here is a brief extract from the main novel's description on Wikipedia:
The novel centres around the adventures of Peter Grant, a young officer in the Metropolitan Police; who, following an unexpected encounter with a ghost, is recruited into the small branch of the Met that deals with magic and the supernatural.
Not unlike the Dresden Files (although quite different in the tone), the series is set in present day, but it reveals that magic, fantastical creatures, parallel universes etc are in fact real. I have been playing with the idea of adapting this series into a RPG setting, but wanted to first check if anyone has tried that before, so we can compare notes.