Benjamin Déboisé, a hatter, his salesman and a young man want to kidnap an American millionaire, put him in a bag and hold him to ransom. But they make a mistake: the fellow they find in the bag is not the millionaire himself, but his son…! More on Wikipedia or Mubi
Watch L’affaire est dans le sac/ English: It’s in the Bag (1932) French Film
No English subtitle
