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Charles Stross: The Nightmare Stacks (2016)

"The Laundry Files' 'fast-paced blend of espionage thrills, mundane office comedy and Lovecraftian horror' (SFX) …

Review of 'The nightmare stacks' on 'Goodreads'

Better than the previous, but the ending was.... abrupt. No epilogue, etc... Not a cliffhanger per say but it left the distinct feeling of 'Is that all?'.