The term 'Queen of Mysteries' is a reference to the fictional detective Ellery Queen, created by Frederic Dannay and Manfred B. Lee. Ellery Queen is an American detective fiction writer and a master sleuth who appears in more than 30 novels and several short stories. He is known for his keen intellect and ability to solve complex mysteries. Ellery Queen is also the name of the author of the books, as well as the main character.