If there was one thing that Don Juan de Marana learned from his father Don Jose, it was that women gave you three things - life, disillusionment and death. In his father's case it was his wife, Donna Isobel, and Donna Elvira who supplied the latter. Don Juan settled in Rome after attending the University of Pisa. Rome was run by the tyrannical Borgia family consisting of Caesar, Lucrezia and the Count Donati. Juan has his way with and was pursued by many women, but it is the one that he could not have that haunts him. It will be for her that he suffers the wrath of Borgia for ignoring Lucrezia and then killing Count Donati in a duel. For Adriana, they will both be condemned to death in the prison on the river Tigre.

At the outbreak of the French Revolution, Charles Darnay goes to Paris to rescue an imprisoned former family servant. He is himself imprisoned and condemned by the revolutionary forces there. His wife, the former Lucie Manette, is secretly loved by a gentlemanly wastrel, Sydney Carton. Carton embarks on a daring plan to save the husband of the woman he loves.

A famous scientist and his beautiful daughter travel to Indochina to find an ivory disc that has the formula for a deadly gas engraved on it. An evil doctor and his gang are also looking for it.

An evil scientist invents a earthquake machine and plots to take over the world from his base in Africa.

A young American girl in Paris falls in love with a handsome nobleman, but he is about to wed in an arranged marriage. She hatches a plan to overcome that obstacle and get her man.

On the mystic island of Lemuria, the cult of Ubasti seek the Egyptian Princess Nadji to sacrifice so that their goddess Ossana, whose soul resides in Nadji's body, may be resurrected by Black Magic. Nadji is located in the Far East port of Suva, but shielded by the White Magical powers of Frank Chandler, an American raised by Eastern mystics who is also known as Chandu. When Chandu takes a voyage alone, however, the evil Voice of Ubasti is able to magically spirit her to Lemuria, where Black Magic reigns supreme. Chandu sets out in pursuit with his sister Dorothy, niece Betty and nephew Bob; but, shipwrecked on the magic island, Chandu finds his family also held prisoner for sacrifice while he is plunged into an endless maze of caverns beneath the evil temple, where both his mortal and magical strength seem rendered useless.