The Rhesus Chart by Charles Stross

 If you read enough, I suppose, odd coincidences take place. For some reason, all three books I checked out from the library this week turned out to be written by British authors. So we'll just dub this the British Invasion Trifecta, and wrap it up with Charlie Stross' latest Laundry File adventure.

Bob and Mo are in a bit of a rough patch in their marriage, and their dinner together simply turns into an argument instead of a path to making up, so Bob heads in to the office for a while to take his mind off of things. He gets a bit more than marriage troubles when one of his colleagues summons a major dweller from another dimension and nearly destroys the New Annex of The Laundry, and when his side project investigating the probability that vampires actually exist bears more fruit than it should have.

This one has a number of good twists and turns, and the usual Stross humor, with Bob getting a "promotion" at the end of the messy affair, but the ending made me very upset. I'm not sure how I feel about going on with this series at this point.

A couple of amusing lines:

"(Zombies)...don't do unease:they're placid as long as they've got some flesh to embody them and the occasional hunk of brains to munch on (Any old slaughterhouse brains will do: they eat them for the fatty acids. At a pinch, you can substitute a McDonald's milkshake.)"

"We use committees for all the ulterior purposes for which they might have been designed: diffusion of executive responsibility, plausible deniability, misdirection, providing the appearance of activity without the substance, and protecting the guilty."