They live as outcasts, hated and feared by the very humanity they protect. They are mutants, born with strange and wonderful powers that set them apart from the rest of the human race. Under the tutelage of Professor Charles Xavier, they are more than mutants. They are the X-Men. Magneto, the X-Men's oldest, deadliest foe, has taken over a top-secret government installation that houses the Sentinels, powerful mutant-hunting robots. The X-Men must fight to keep this deadly technology out of Magneto's hands. But the Acolytes, Magneto's fanatical mutant followers, stand between the X-Men and victory—a victory that’s quickly slipping away—for a more ruthless enemy, the U.S. government, holds the X-Men responsible for the installation's takeover! This electrifying new novel by acclaimed author Christopher Golden is the ultimate adventure that no X-fan should be without!