It will prove to be one of Batman's most challenging adventures as a new hero joins the Dark Knight's continuing cast of characters in BATMAN: SWORD OF AZRAEL. Azrael is the enforcer for the secret Order of Saint Dumas, a society whose existence dates back to the time of the Crusades. When this bullet-riddled angel of death crashes into the midst of a Gotham City parade, Batman is drawn into the mystery of Azrael, launching them on a quest that leads both Batman and the young Azrael to Europe where they separately investigate the systematic slaying of the members of the Order of Saint Dumas.
Dennis "Denny" O'Neil was a comic book writer and editor best known for his work for Marvel Comics and DC Comics from the 1960s through the 1990s, and Group Editor for the Batman family of titles until his retirement.
His best-known works include Green Lantern/Green Arrow and Batman with Neal Adams, The Shadow with Michael Kaluta and The Question with Denys Cowan. As an editor, he is principally known for editing the various Batman titles. From 2013 unti his death, he sat on the board of directors of the charity The Hero Initiative and served on its Disbursement Committee.