St. Louis County Library This ticketed event is sold out. In this fourth installment of the bestselling series, the Greek and Roman demigods from the Prophesy of Seven must work together to seal the Doors of Death and help Percy and Annabeth escape the Underworld in the process. Rick Riordan will read and answer questions. Each ticket includes a pre-signed copy of House of Hades and there will be additional pre-signed copies available for sale. Rick Riordan will not be signing at the event.