Dumb Witness

Poirot receives a rambling letter from a woman, which tells him absolutely nothing at all. But there is one curious feature to this letter. It was written two months ago. This arouses Poirot's curiosity and he pays the woman a visit, only to discover that she died a while after writing the letter, apparently of natural causes. Murder? No, says Hastings. Yes, says Poirot. And we know which of them we would believe!