The world's greatest paranormal detective meets the world's greatest paranormal!

Word at the Bureau for Paranormal Research and Defense says there's a ghost in Arcadia. A ghost that hunts. A ghost that kills people. Not the kind that pushes you down a flight of stairs or grabs the wheel when you're driving -- the kind that cuts you in half with a pair of .45 automatics. If she's a ghost -- a "real" ghost -- then she's one of a kind, and the Bureau wants her. While in pursuit of this vengeful spirit, Hellboy stumbles upon a dark secret . . . Something happened a long time ago, something occult and ominous, something involving murder. This "something" has swallowed up Hellboy and Ghost -- an evil so deep they've fallen off the face of the earth. And when they land, there will be hell to pay.