SECRET AGENT "X" - one of the few hero titles published by Ace Magazines, also known as Magazine Publishers, or Periodical House. Edited by the husband and wife team of A.A. Wyn, and his wife Rose. SERVANTS OF THE SKULL by Brant House (Pseudonym) "From the macabre maze of a labyrinthian world, the Skull, master of murder, reached out and made of mighty men imbecilic wreaks, derelicts, no longer human. Only one man could match brains with the sinister Skull-and that was Secret Agent "X". But the Skull did not feat "X", because The Man of a Thousand Faces had one vulnerable spot-and the Skull knew where it lay.