I highly recommend "Halting State" by Charles Stross. It's technically sci fi, being set around 10 years into the future, and concerns a novel crime being investigated by a Police sergeant, a forensic accountant, and a games industry worker. The crime (minor page 1 type spoiler!)...
is a bank robbery committed inside a MMORPG by a bunch of orcs. The theft is on a grand enough scale to destabilise the economy of a game large enough to dwarf WoW.
The slight time hop forwards allows for some pretty feasible technological developments, in both gaming and the real world, which are well explored and explained (though I do not work in the industry, and so cannot speak to the more complex stuff).
The involvement of the accountant is due to investment and insurance involvement, and gives the author a great way of discussing the "big business" aspect of the industry.
I am involved in the UK criminal justice system (the book is set in an independent Scotland, which is a bit of an indulgence on the part of the author, but also allows some fudging of the jurisdictional differences between England, Scotland and the EU) so I find the legal aspects very interesting. As items and experience in online worlds involve an increasing amount of real world financial value such as buying items on eBay, through post release transactions, or having someone designing art for a fee to put in your Second Life home, the role of law enforcement in such issues is actually becoming a foreseeable reality.
If nothing else, it is a thoroughly engaging mystery. The only thing that might put some off is the fact that the story is told from the perspectives of the three characters mentioned, and all 3 use the second person to do so. Eventually, I clicked that the idea was to give it an almost game like feel by placing you within the character, like the narration in the old text based games I used to play on my BBC Model B a few decades ago.