"Poirot Investigates" by Agatha Christie is a short story collection first published in 1924. The eleven tales follow the eccentric Belgian detective Hercule Poirot as he unravels mysteries driven by greed, jealousy, and revenge. From stolen diamonds and suspicious deaths to international espionage, each case challenges Poirot's brilliant deductive mind. With his friend Hastings by his side, Poirot employs psychological insight and theatrical flair to expose criminals and reveal the truth behind seemingly impossible crimes.