Best-selling children’s author Rick Riordan launched the third and final book in his Norse mythology series at the Library of Congress on October 3. Hundreds of elementary and middle-school students from Washington, D.C., and Maryland joined him in the Coolidge Auditorium, while groups from Colorado, Mississippi, New Jersey, Ohio and elsewhere watched on Livestream as he announced the release of “The Ship of the Dead,” book three in the series “Magnus Chase and the Gods of Asgard.” Here Riordan takes a question from the audience.