Batman #63 Cover A NM

There are strange goings-on in the dark alleys of Gotham City, mysteries that will require a different skill set than the Caped Crusader's if he's going to stop the whole city from succumbing to the darkness. John Constantine, the Hellblazer, is a person with just those skills-but after the events of "The Witching Hour," is Constantine in any condition to help the Dark Knight Detective?