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#72 The Atrocity Archives by Charles Stross
This was a rather fun read, it was sorta of a Lovecraft comedy. You can summon demons with your computer or certain mathematical formulas. Bob works for an outfit that stops people from finding this out and letting the demons lose in our world. The book is actually two novellas. There is more in the series and I'm sure I will be picking it up one of these days to catch up on it.