黑咖啡 法国版 Le coffret de laque (1932)认领

　　A chemist is working on a very important and secret new formula in a quite isolated country house. He believes someone is wanting to rob this formula and informs a friend, who is a detective. One night when several guests are in the house, the formula is stolen indeed and the chemist is about to be poisoned with a drug out of a lacquered box.