Lord Edgware Dies by Agatha Christie

It's true; Hercule Poirot had been present when the famous actress Jane Wilkinson bragged of her plan to ‘get rid of’ her estranged husband, Lord Edgware.

Now the man was dead. And yet the great Belgian detective couldn’t help feeling that he was being taken for a ride. After all, how could Jane have stabbed her thoroughly detestable husband to death in his library at exactly the same time she was seen dining with friends? And what could be her motive now that the aristocrat had finally agreed to grant her a divorce?