Black Coffee

Sir Claud Amory has discovered the formula for a new powerful explosive, which is stolen by a member of his household. Locking everyone in the library, Sir Claude switches off the lights to allow the thief to replace the formula. When the lights come on, he is dead. Hercule Poirot investigates.

Sir Claud Amory has discovered the formula for a new powerful explosive, which is stolen by a member of his household. Locking everyone in the library, Sir Claude switches off the lights to allow the thief to replace the formula. When the lights come on, he is dead. Hercule Poirot investigates.