Taking all of her published works into account, Agatha Christie's books have been surpassed only by William Shakespeare and the Bible. However, the 1930s were his most successful decade. During this time she wrote fourteen Hercule Poirot novels, two Miss Marple novels, six additional detective books, two story collections, two plays and a novel under the pseudonym Mary Westmacott. During her life, she wrote sixty-six detective novels, one hundred and fifty-four short stories, thirteen plays and six romance novels. Each of his mysteries is still printed in Britain and over five hundred thousand copies are printed each year. The Mousetrap, written in 1947, is still running today and is the longest continuously performed play in the world. His most famous book is considered to be And Then There Were None. Although she had many successful works, she said that The Mystery of the Blue Train was the worst book she ever wrote (Bautista,