Lots of snarky asides and current slang mixed with some consciously grandiose language. A sample paragraph from early in the book:

The Lady of the Ninth House stood before the drillshaft, wearing black and sneering. Reverend Daughter Harrowhark Nonagesimus had pretty much cornered the market on wearing black and sneering. It comprised 100 percent of her personality. Gideon marvelled that someone could live in the universe only seventeen years and yet wear black and sneer with such ancient self-assurance.</blockquot