A falsely accused spy thinks of nothing but revenge for twenty years while sitting in jail, but the man who will pardon him is murdered before he can reach the prison.

A mad scientist, who is dying from an incurable heart disease, builds a time machine. He then relives December 31 over and over again so that he can repeatedly kill his cousin who has wronged him. Lamont Cranston and Margot Lane are the only two conscious enough to realize the repetition of New Year's Eve, and together they successfully change the course of events to prevent the villain's evil deed.

A man with a special visitor pass to a prison takes a tour of the "Death House." The deranged guard forces the guest to sit in the electric chair, then straps him down and gives him the ultimate thrill.

A mad musician threatens the city with his, "Symphony of Silence in E-flat" in which hidden bombs explode at a loud noise.

A doctor experimenting with chemicals in his lab accidentally blinds his assistant. The directors who own the lab threaten to fire the doctor because of the incident. The doctor takes revenge by shooting them with a rifle, hoping people will think they were all suicides.

An embezzler and his gang hides out on a secluded island off the coast of Nova Scotia and The Shadow goes after them.

A criminal lawyer clears his clients only to force them into a series of robberies.

Pirate's sink their boat on purpose in order to fool another ship to "rescue" them. The ruse works and once aboard the new ship, the head pirate promptly shoots the captain and Lamont Cranston's friend, Sir John.

The city is in a panic after being blackmailed by a criminal using a stolen black fog machine. He has plunged the city into darkness, and if five million dollars isn't paid, he threatens to add a poisonous gas to the fog and kill everyone.

A convict on death row asks to see The Shadow before he goes to the chair. He confesses how his crooked lawyer is planning an insurance scam. The Shadow goes after the attorney, but becomes trapped by an electric photo beam in a death chamber.