High and Low (1963)

A wealthy businessman is told his son has been kidnapped and he will have to pay a very large sum for him to be returned safely. It is then discovered that his son is safe at home: the kidnapper took his chauffeur's son by accident. The kidnapper says this makes no difference: pay up or the child dies. This leaves him with a moral dilemma, as he really needs the money to conclude a very important business deal.