Ok, before I start, read the first two before you read this one, as they were excellent books as well, and you really have to read the other two just to get the story in this one.
This book was amazing. Roman finds a way to perfectly balance out all the different characters in the book and it is well written...simply put.
This part of the trilogy takes you to the version of earth where the Red Skull comes upon the cosmic cube, bringing about the Fourth Reich where the nazis had defeated the allied forces in World War 2. Mutants are considered the scum of the earth and the Skull goes by means of special task forces, and sentinels to apprehend these genetic impurities. Cyclops (who's secret as a mutant isn't discovered until mid-story) and his wife (Frau Sommers) are the poster-couple of the empire, Storm presides in Africa where all colored humans and mutants were sent to- her powers deactivated genosha-style, Magneto is in a concentration camp, Nightcrawler is on the Lightning Force strike team of the empire (though he is still considered scum, he only gets to be on the team because he is a true german), rogue is a tool of the empire, gambit is a collared worker, professor x is a traitor to the mutant race, leaving Psylocke and Warren the only 2 X-Men left unaffected by the cube. The story has 2 plots really that are going on. Betsy and Warren are up in the citadel where Doom is ascending to god-hood (won't tel you how), and of course you have the cube/Red Skull storyline. Definitely a 2 thumbs up!!!