Halting State
Sergeant Sue Smith is called in to investigate a daring Edinburgh robbery at a dot-com startup company, a crime perpetrated by a band of marauding orcs with a dragon in tow in the virtual reality land of Avalon Four, but she soon discovers that events in the virtual world could have a devastating impact on the real one, especially when an unknown enemy launches attacks on both. Reprint.
Booko found 9 book editions of Halting State by Charles Stross
Booko collects this information from user contributions and sources on the internet - it is not a definitive list of editions. Search Booko for other editions of Halting State.