The scene where Tracy uses the infrared light bulb to reveal the presence of the Ghost was accomplished simply by printing the film in negative form.
Chapter Titles:
1) The Fatal Hour, 2) The Prisoner Vanishes, 3) Doom Patrol, 4) Dead Man's Trap, 5) Murder at Sea, 6) Besieged, 7) Sea Racketeers, 8) Train of Doom, 9) Beheaded, 10) Flaming Peril, 11) Seconds to Live, 12) Trail by Fire, 13) The Challenge, 14) Invisible Terror, 15) Retribution.
Opening credits: The characters and events depicted in this motion picture are fictitious. Any similarity to actual persons, living or dead. is purely coincidental.