Megalomaniac Larry Ellison clone Ellis Billington is messing around with things that Man Should Wot Not Of, things that can eternal lie, silent in the abyssal depths. Bob is the only Laundry agent with the necessary combination of skills and knowledge to handle this, so he's sent in. But not alone: along for the ride is Ramona Random, gorgeous femme fatale from the CIA's Black Chamber. And they're destiny-entangled first, which makes Bob worry about what he's going to tell girlfriend Mo.
There are some lovely scenes. Where Bond gets the Aston Martin, Bob gets a SMART car. Where Bond gets the sharp tailored designer gear, Bob gets, well, the same, only Bob has no idea how to wear it. And where Q gives Bond all manner of high-tech gadgetry, Bob gets kitted out by Pinky and Brains - and it's the kind of high-tech gear Bob can use.
It's packed full of in-joke references to many source concepts. Bond books, Bond movies, Cthulhu stories, geek (Bob's middle names are Oswald and Francis!) and governmental, and a delight to read. It's followed up with Pimpf, another Bob short story - at least, it is in the hardback I have.