Hercule Poirot:
* The Murder of Roger Ackroyd (1926): This book is often considered Christie's masterpiece, introducing the iconic detective in a groundbreaking plot twist.
* Murder on the Orient Express (1934): A classic locked-room mystery set on a train, with multiple suspects and a surprising solution.
* Death on the Nile (1937): Another classic locked-room mystery, this time set on a luxurious river cruise.
* And Then There Were None (1939): A chilling and suspenseful story of ten people trapped on an island with a mysterious killer.
* The A.B.C. Murders (1936): A serial killer case that tests Poirot's deduction skills to the limit.
Miss Marple:
* The Murder at the Vicarage (1930): The first novel featuring the lovable and observant Miss Marple, who uses her knowledge of human nature to solve crimes.
* The Mirror Crack'd from Side to Side (1962): A darker and more complex Miss Marple story set in a picturesque village.
* A Murder is Announced (1950): A classic Miss Marple mystery with a clever premise and a satisfying conclusion.
Other Notable Novels:
* The Secret Adversary (1922): The first novel featuring Tommy and Tuppence Beresford, a dynamic duo who solve mysteries during World War I.
* The Big Four (1927): A thrilling spy story featuring Hercule Poirot and a sinister international criminal organization.
* Appointment with Death (1938): A captivating story set in the Middle East, showcasing Christie's masterful use of setting and atmosphere.
* Crooked House (1949): A complex and intriguing mystery involving a wealthy family and a series of suspicious deaths.
* Ten Little Indians (1939): Another chilling and suspenseful story, also known as "And Then There Were None."
Other Factors to Consider:
* Your personal preferences: Do you prefer classic locked-room mysteries, psychological thrillers, or stories with a strong sense of place?
* Your level of experience with Agatha Christie: If you're new to her work, you might want to start with one of her more popular and accessible titles, such as "Murder on the Orient Express."
* Availability: Some of Christie's books are more readily available than others, depending on your preferred format (print, ebook, audiobook).
Ultimately, the best way to find your favorite Agatha Christie books is to explore her diverse catalogue and discover what resonates with you. There's a reason why her works remain so popular even decades after their publication; she was a master of suspense, character development, and plot twists.