Doomsday Affair

His name was Tixe Ylno. The U.N.C.L.E files could tell nothing about him except for that code name. He could be anyone--a cab driver, a corporation executive, a scientist, a storekeeper...ANYONE! He might be anywhere in the United States. But whoever or whatever he was, U.N.C.L.E. had to find him because he controlled a secret that had the world at his mercy!