Fiction: Occult Espionage???

The Atrocity Archive - Charles Stross

It is a little hard to classify Stross' Laundry Files series. The protagonist is basically a tech support guy turned field agent in a British Intel agency (The Laundry) that combats a version of the Cthulhu Mythos. This is the first book in the series so the plot wanders a little in the interest of world building. Bob Howard is unwittingly drawn into an investigation of a cult that plans to wipe out all life on Earth... sort of.

It is incredibly funny and meta, packed with jokes abut everything from computer science to pinky and the brain. There is a ton of historical anecdote presented in a funny and smart way. Lovecraft himself existed in universe but is viewed as a deluded hack. American Occult int is literally run by demons. A major british spymaster goes by the name Angleton more or less to spit the CIA and so on. The Laundry itself is a hilarious commentary on the bureaucratic nature of government and intelligence. The end of the world is literally around the corner but more importantly you filed your expense form incorrectly. 

It is a weird book that is very hard to classify but it is an insane romp that is both hilarious and creepy and I just ADORE the universe.