Chapters: 1) Who Is the Clutching Hand? - 2) Shadows - 3) House of Mystery - 4) The Phantom Car - 5) The Double Trap - 6) Steps of Doom - 7) The Invisible Enemy - 8) A Cry in the Night - 9) Evil Eyes - 10) A Desperate Chance - 11) The Ship of Peril - 12) Hidden Danger - 13) The Mystic Menace - 14) The Silent Spectre - 15) The Lone Hand.
After Charles Locher changed his name and found fame as Jon Hall, this serial was re-issued with a hastily prepared art card reading "Starring JON HALL" crudely spliced into the opening credits.
Despite the title, there is no "Mystic Menace" in Chapter Thirteen.
Craig Kennedy drives a brand new 1936 Dodge Sedan.
Shirley McMillan (i.e. Ruth Mix) drives a 1936 Ford coupe.