James Stewart plays aeronautical engineer Theodore Honey, the quintessential absent-minded professor: eccentric, forgetful, but brilliant. His studies show that the aircraft being manufactured by his employer has a subtle but deadly design flaw that manifests itself only after the aircraft has flown a certain number of hours. En route to a crash site to prove his theory, Honey discovers that he is aboard a plane rapidly approaching his predicted deadline.

Tells the story of Mary Tudor and her troubled path to true love. Henry VIII, for political reasons, determines to wed her to the King of France. She tries to flee to America with her love but is captured when she is "un-hatted" on board ship. In return for her consent to the marriage with France, Henry agrees to let her choose her second husband. When King Louis of France dies, Mary is kidnaped by the Duke of Buckingham. He tries to force her to marry him but she is rescued by her love in an exciting battle on the beach.

A British physician stands trial for murdering his wife after he and his mistress are captured while fleeing to Canada.

Two rival gangs are trying to fix horse races and a jockey is attacked and left for dead in a stage-managed car crash. An insurance investigator makes routine enquiries into the "accident" and one of the gang leaders feels threatened by this and takes counter measures.