In 19th century England, a noted brain surgeon rescues a former student from being hanged on a false conviction for murder, and spirits him away to an ancient, repurposed abbey far in the countryside. There, he connives his pupil into assisting him in mapping the functions of the various parts of the human brain, using living subjects who are under a terrible animation-suspending drug called "black sleep". Subsequently, the student, along with the daughter of one of the subjects, discover that most of these subjects have survived but are being kept in a dungeon-like cellar, in various stages of physical and mental derangement...

After Tarzan's estate is destroyed by Arabs Jane is sold into slavery by a man posing as a friendly scientist. Tarzan develops amnesia after a blow to the head. When he recovers his memory (from a later blow) he defeats the villain, recovers the fabulous jewels of Opar, and rescues Jane.

When his mother dies, young Peter Ibbetson leaves Paris and his best friend, Mary, behind to live with a severe uncle in England. Years later, Peter is an architect with little time for women, until he begins a project with the Duke and Duchess of Towers. When Peter and the duchess become great friends, she reveals that she is Mary — but the duke soon suspects his wife of infidelity and challenges Peter to a duel, threatening the pair's second chance.

An ex-soldier turned highwayman uncovers a plot to take control of England from King Charles II.

When Ivy, an Edwardian belle, begins to like Miles, a wealthy gentleman, she is unsure of what to do with her husband, Jervis, or her lover, Dr. Roger. She then hatches a plan to get rid of them both.

An American junior diplomat in London rents a house from, and falls in love with, a woman suspected of murder.

A young woman inherits a newspaper whose editor refuses to hire lady reporters.

British army sergeants Ballantine, Cutter and MacChesney serve in India during the 1880s, along with their native water-bearer, Gunga Din. While completing a dangerous telegraph-repair mission, they unearth evidence of the suppressed Thuggee cult. When Gunga Din tells the sergeants about a secret temple made of gold, the fortune-hunting Cutter is captured by the Thuggees, and it's up to his friends to rescue him.

South western Pennsylvania area of colonial America, 1760s. Colonial distaste and disapproval of the British government is starting to surface. Many local colonists have been killed by American Indians who are armed with rifles supplied by white traders.

A wealthy man falls for a widow but is locked into a loveless marriage with a woman who has contrived to convince his parents she is the ideal wife.