Taking into account all of her published works, Agatha Christie's books were surpassed only by William Shakespeare and the Bible. However, the 1930s were his most successful decade. During this period, she wrote fourteen Hercule Poirot novels, two Miss Marple novels, six more mystery books, two collections of short stories, two plays, and one novel under the pseudonym Mary Westmacott. Over the course of his life he wrote sixty-six detective novels, one hundred and fifty-four short stories, thirteen plays, and six romance novels. All his mysteries are still in print in Great Britain, and more than five hundred thousand copies are printed every year. The Mousetrap, written in 1947, is still on the air today and is the longest-running play in the world. His most famous book is considered And Then There Were None. Although he had many successful works, he stated that The Blue Train was the worst book he ever wrote (Bautista,