Inspiration

Charles Stross book Halting State has an interesting premise that maybe you could rework into something original. It's about a bank robbery that happens in an MMORPG.

"A near-future thriller set in the bizarre world of the software houses that develop massively-multiplayer online roleplaying games. A bank has been robbed, a start-up company's massive IPO postponed, and the company's lead programmer has gone missing. It's up to an unlikely team of investigators, sent in by the venture capitalists backing the IPO, to figure out what happened and get the money back. There's just a slight catch: the robbers were a gang of Orcs, and the money may have been smuggled over the border into another reality .... "
http://www.antipope.org/charlie/fiction/faq.html