Agatha Christie (1890 – 1976) was an English writer known for her sixty-six detective novels and fourteen short story collections, particularly those revolving around fictional detectives Hercule Poirot and Miss Marple. "And Then There Were None" is one of the highest-selling books of all time. "The Mousetrap" holds the world record for the longest initial run. In 2013, she was voted the best crime writer and "The Murder of Roger Ackroyd" the best crime novel ever by 600 professional novelists of the Crime Writers' Association.
Christie died peacefully on 12 January 1976 at age 85 from natural causes at home at Winterbrook House.
Here is an article on Agatha Christie's fiction.