Dr. Cordelier, living in a suburb of Paris, withdraws from society to pursue research into the functioning of the human brain. His lifelong friend, Maître Joly, becomes concerned when Cordelier draws up a will that bequeaths his entire estate to a stranger, Monsieur Opale; he cannot understand why Cordelier defends him, considering Opale attacks women and children. After a colleague is killed, Joly confronts Cordelier and discovers the truth behind his friend's behavior.
Caprices tells the story of two young rich people. A famous actress poses as a poor florist, and a distinguished society man camouflages himself as forger and swindler. This game leads them to make close relations in a series of adventures.
A young woman's comfortable life with her boyfriend is disrupted when he leaves for military duty, entrusting her to a playboy friend seeking a fake marriage for inheritance. Complications arise as a prince enters the scene, pursuing her romantically.
