Ellery is a fictional detective created by American author and screenwriter Frederic Dannay. He is the protagonist of the long-running series of detective novels written under the pseudonym of 'Ellery Queen'. He is an amateur detective who solves complex cases with the help of his father, Inspector Richard Queen. Ellery is known for his intelligence, wit, and deductive skills. He is also known for his use of disguises and his ability to solve seemingly impossible cases.