True Believers: House of M #1

The Scarlet Witch has killed a number of her fellow Avengers and continues to become more and more unstable despite the best efforts of Professor X and her father, Magneto. The X-Men meet with the old and new Avengers to discuss what is to be done about the problem she presents. Arriving in Genosha, our heroes cannot find Wanda and before they can track her down, the Scarlet Witch recreates the world according to her own design.