Sanctuary (X-Men Mutant Empire #2)

The Big Apple has been taken over by the X-Men's arch-enemy, Magneto. He's declared it a haven to all mutants, vowing to rule the new empire with his Acolytes--with their law enforced by reprogrammed Sentinels. The X-Men must penetrate the enslaved city and stop Magneto before he advances his mad plan to expand his empire from New York to the entire world!