X-Men: Book of Revelation #1

X YEARS LATER, after the assassination of one of his prized Choristers, Revelation welcomes a new mutant to his capital city of Philadelphia. But the capital of the Revelation Territories hides many dangers, not the least of which are her rival Choristers — and Fabian Cortez will allow no one to challenge him for Revelation's favor. But this new mutant has a secret ally – the Ghost of Philadelphia!