The mysterious death of a well-known criminal sparks an investigation into national security.

Schomberg, an enigmatic psychiatrist runs a nursing home. He is forced to close his clinic and disappear to escape the police. But he wants revenge on his wife's lover, Didier Laurent, a former RAF fighter pilot. Didier meets a young trapeze artist, Paula, with whom he falls in love. The happiness of the two young people is disturbed by the assassination of Irene, strangled by Schomberg who casts suspicion on Didier. Fortunately for them Commissioner Ulysses knows the truth and forces Schomberg to commit suicide.

François, a young student at a provincial college, likes Colette, the daughter of the headmaster. Turlot his colleague, who commits suicide, left a diary where he writes of his relationship with Colette.

Elfy, Countess of Saint-Hélié's daughter, was brought up with her foster sister Anne, in an old dilapidated castle whose landlord, Baron Julius Carol, disappeared mysteriously some day. The two girls had a playmate, Hervé, the son of the gamekeeper. Now that they are adult, Anne is in love with Hervé while Elfy thinks she loves the young man. One day, the baron's mummified body is found in an oubliette and the secret of the estate is revealed...

In 1914, in the first months of World War I, Louise Jarraud loses her husband, killed on the front. Shortly after, she gives birth to a baby, who soon dies. Devastated by this double misfortune, Louise decides to dedicate her life to caring for the children of others. She becomes a nurse with several employers, giving her affection to little boys or girls. A widower and another man propose to her but she refuses twice determined as she is to live only for the children in her charge.