When Martin's raiding guild join the latest virtual reality MMO, they discover a challenge like no other. Strata Online is a 100-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. 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.