In which work did Detective Poirot meet Countess Vera?

The detective Poirot met Countess Vera in three works: Double Clues, Kiel burrows, the Bad Dog, and Four Demons.

In 1 and 1922, Poirot first met Countess Vena Rosake in Double Clues, and Countess Rosake appeared as a female thief.

2. 1924, in the Four Demons, he first mentioned Achilles to Hastings. After pretending to be dead, he shaved off his beard, put on a fake beard and pretended to be Poirot, who was actually Poirot himself. Finally, Countess Rosakov helped Poirot because Poirot saved the Countess's son Nick. At the end of the incident, Poirot retired and planned to get married.

3. At the end of1939-1940, Poirot met Countess Rosakov again in "Uniform Bad Dog Kyle poros" and learned that she became a philanthropist and her son became an engineer.

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