The main protagonist was a genius game designer / CEO of a computer game company, who knew where the minable resources in the game were, because he was the one who created the very realistic geology of the game world. Since the in-game ores / currency became quite valuable in real money he was under attack / taken hostage or something in that vein. He had to hide for a while and later tried to get back to his estate to claim his company back.
I remember there was a big finale where he traveled over some mountain range to get back to his estate (he lived close to the Canadian border, I think), but he was finally ambushed in a valley a few miles from there. He knew a shepherd or local farmer of sorts in the area and also had a young girl in tow if I remember correctly. So, when the gunmen finally came for him (which he expected and therefore was prepared somewhat), he took them out with the help of said farmer, despite one of the baddies using grenades or a missile launcher or something similar at the very end.
I also vaguely remember another scene -- if I'm not mixing this up with a completely different story -- where he put his car in a parking garage. This car / security system had a peculiar name and was described in some detail: it warned everyone who even came near it with a booming voice, threatening severe countermeasures if anyone so much as looked at it a few milliseconds too long, resulting in a wide area around it ending up free of other cars when the owner finally came back...
There's not much more in my (admittedly foggy) recollection of this story.