When Martin's raiding guild join the latest virtual reality MMO, they discover a challenge like no other. Strata Online is a hundred floor mega-dungeon, filled with an ever-shifting ecosystem of monsters. Martin's team soon find themselves in a race against the world’s strongest guilds, all competing to be the first to reach the unbeatable game's lowest depths. Stranger still, they must now contend with Sin, a twisted morality meter which can transform a players’ class into its dark counterpart. With eternal fame and prizes on the line, Martin risks playing as a rarely chosen race; a Murovan rat-man, combined with the unusual exorcist class. But unlike other games, he will need as much courage as skill to progress. Because the deeper he goes, the darker Strata gets.

Martin and Iron Riot have made their mark on the Dungeons of Strata, slaying the first of the nightmarish Archdukes faster than anyone could have hoped. Yet the dungeon has left its marks on them too. Scarred with wounds that will not heal and changed in ways that he cannot comprehend, Martin must contend with the mysterious true nature of the game and the lengths that the Masters who made this world are willing to go to keep their secrets. The Masters have complete control over everything in Strata. They now hunt Martin outside the game, using every means at their disposal to put a stop to his progress. But they have forgotten the age-old adage: Never corner a rat.

Martin dug too deep, he uncovered secrets that the Masters wanted buried forever, and now he must face his punishment. Trapped inside the game that they once loved, Iron Riot are now faced with a slow death by dehydration as their bodies in the real world are left to rot. The Masters, enigmatic creators of Strata, are willing to let anyone die so long as it preserves their perfect imaginary world. But there was one thing that they haven’t accounted A rat with a plan. If Iron Riot can finish the game before the timer runs out, defeat the Archdukes, beat the system, and show everyone what they are capable of, then they’ll have the attention of the whole world. The Masters won’t be able to hide in that spotlight. They might be all-powerful, but that doesn’t mean that their hands can’t be forced. At least, that’s what Martin told them the plan was…