The dumb witness

When Lady Arandell unexpectedly fell from the stairs of her own house, everyone around saw in this only an unhappy accident - after all, she stepped on a rubber ball left there with her favorite, a fox terrier nicknamed Bob. But the more the victim herself thought about it, the more it seemed to her that one of her relatives set up a fall. She wrote a letter to the famous detective, Erkul Poiro with a request to figure out this matter. But while the letter was going to the addressee, Lady Arandell was already dead, and her rather big inheritance passed to the companion. Poirot is not able to resurrect the unfortunate lady, but he can find a killer. And the same dog named Bob will help him in this