Le glaive et la balance

Le glaive et la balance (English: The Sword and the Balance and Two Are Guilty)) is a 1963 French-Italian crime drama film directed by André Cayatte. It was written by Cayatte, Henri Jeanson and Charles Spaak and stars American actor Anthony Perkins as the protagonist.
Plot.
On the French Riviera, after the son of a wealthy local woman is kidnapped for ransom, the police begin an investigation. The kidnappers manage to escape the police, killing their victim in the process, but three men are eventually discovered by the police at a lighthouse.