Three siblings who detest each other and hiking must complete together a pilgrimage to Santiago de Compostela in order to be eligible to inherit their mother's wealth.

After World War I, a young ex-soldier, Sébastien Monge, returns to his home village. Ignorant of his past, he learns that, 24 years before, his entire family was slain in their home one stormy night. Only Sébastien, then a four-month old baby, was spared. Whilst Sébastien is being seduced by Charmaine, Dupin is killed by someone else. Sébastien’s next victim, the miller Didon Pujol, is also murdered before he has a chance to take his revenge. Sébastien realises that someone is watching his every move and is going to extraordinary lengths to protect him. But who, and why..?

Max, who dreams of adventures, abandons his studies at 18 to become involved in the navy. He becomes the sailor 512.

Claude Massoulier is murdered while hunting at the same place as Julien Vercel, an estate agent who knew him and whose fingerprints are found on Massoulier's car. As the police discover that Marie-Christine Vercel, Julien's wife, was Massoulier's mistress, Julien is the prime suspect. But his secretary, Barbara Becker, while not quite convinced he is innocent, defends him and leads her private investigations.

Parisian everyman Antoine Doinel has married his sweetheart Christine Darbon, and the newlyweds have set up a cozy domestic life of selling flowers and giving violin lessons while Antoine fitfully works on his long-gestating novel. As Christine becomes pregnant with the couple's first child, Antoine finds himself enraptured with a young Japanese beauty. The complications change the course of their relationship forever.

The third in a series of films featuring François Truffaut's alter-ego, Antoine Doinel, the story resumes with Antoine being discharged from military service. His sweetheart Christine's father lands Antoine a job as a security guard, which he promptly loses. Stumbling into a position assisting a private detective, Antoine falls for his employers' seductive wife, Fabienne, and finds that he must choose between the older woman and Christine.