Agatha Christie's first novel "The Mysterious Affair at Styles" published 1921

Agatha Christie's first novel The Mysterious Affair at Styles, introducing Belgian detective Hercule Poirot, was published in the UK January 21, 1921.  It had been published the previous October in the US.  It was well-received by critics and remains one of her best.

The Mysterious Affair at Styles was adapted for television and aired as an episode on ITV's series Poirot starring David Suchet as the detective in September 1990.  

Since its initial publication, it has been re-released in hardcover and paperback dozens of times.

Agatha Christie's "Poirot" premieres 1989

ITV's long-running series Poirot starring the amazing David Suchet premiered January 8, 1989.  The Adventure of Clapham Cook, based on a short story published in September 1974, was the first episode and the series ran until 2013 when they ran out of Agatha Christie's works.

Happy birthday, Hercule Poirot!

David Suchet, born May 2, 1945, is best known for his portrayal of Agatha Christie's super-sleuth Hercule Poirot.  He played the character from 1989 - 2013, making him an actor with one of the longest running characters on television.