Cover by John Romita Jr and Bill Sienkiewicz. Witness what hides within the Sinister House-the DCU's most horrific secrets and mysteries! Travel alongside Harley Quinn, John Constantine, Detective Chimp, Zatanna, the Atom and others as they face this macabre devastation firsthand! And in the bowels of this dark mansion…we return to the world of the legendary Red Rain to meet once again with the dreaded vampire Batman. Don't miss this year's DC Halloween special-because if you do, it'll haunt you!