**edited 12/20/13 
 What would you get if you substituted a computer nerd for James Bond, then sent him off to fight Lovecraftian Deep Ones? Well, in fact, you'd get this book. 
 There's this fun (well, depending on how humorous you find Lovecraft) little story ("Dreams in the Witch-House") in which a mathematician discovers that very abstruse topological mathematics can transport one to far-off dimensions and manifolds in which (you guessed it) the uber-horrors lurk. In the Laundry series, Charles Stross takes this idea one step farther. In his world, sufficiently advanced technology is not only indistinguishable from magic, but has the adverse effect of breaking down barriers to dimensions where all the demons and cthulhuian monsters and so on live. It's like the ultimate wish fulfilment for computer scientists, because the difference between a program and a spell is just a little Enochian, a bit of blood, and a lot of know-how. 
 Bob Howard is a programmer--uh, computational demonologist-- at the Laundry, the top-secret British department that focuses on the occult. As far as I can tell, he's kind of a sysadmin (see, it goes to show--all the sysadmin all have occult powers!) but also does a bit of field work: demon banishing, spell patchups, cult dispersals, that sort of thing. When, during an apparently routine assignment, Bob is forced into "destiny entanglement" with a demon, he knows things are about to get tricky. Soon enough, he's forced into an arrangement with a beautiful and deadly foreign spy, on an island full of hostile powers, dressed to the teeth in his tux, losing horrifically at baccarat, and driving his seriously decked out car (a Smart car rather than an Aston Martin--governments have a budget to stick to!), and a license to implant rather deadly computer viruses into the evil mastermind's mainframe. All this is adding up to make poor Bob quite shaken, and not particularly stirred. 
 ...And that's all I'm going to post here. 
 The rest of my (rather verbose) review is posted over here at Booklikes. 
 Why? Because I disapprove of GoodReads' new policy of censorship, and will no longer allow my full reviews to be posted here.