A young intellectual, Hugo, joins the Communist Party out of a sense of idealism, only to see his principles manipulated by party leaders. He is given the assignment of killing Professor Hoederer, a party deviationist. However, he grows to admire the man and begins to have doubts about morals and revolutionary politics. But jealousy - Hugo thinks Hoederer has made love to his wife, Jessica - takes matters out of the political realm.
Cavalcade D'Amour is divided into three sections, each depicting a romance occurring within the walls of the Chateau de Champs. Legend has it that whoever marries in the Chateau is doomed to an unhappy life. This proves to be the case in 1639 and 1839, but the heroine of the 1939 segment, Corinne Luchaire, is determined to break the jinx. She is convinced that she will prove an unsuitable bride for Claude Dauphin, and he is likewise convinced that he will turn out to be an inadequate groom. But the couple's respective families will not be dissuaded, and the marriage takes place as scheduled? with unexpectedly happy results!
The mysterious vigilante Milton has warned Scotland-Yard of his intention to kill the lawyer Maurice Meister who is the cause of his sister's suicide. Police and detectives watch over the lawyer's home, but on the day and at the appointed time Meister is murdered.