The penultimate book in the bestselling }Heroes Of Olympus{ series set in the world of Percy Jackson. The Greek and Roman demigods must work together to seal the Doors of Death - and help Percy and Annabeth escape the underworld in the process... Capitalises on the explosion of interest in 'Rick Riordan Mythmaster' from the Percy Jackson film (August 2013) by teasing }Heroes where possible. 'A cracking read' }Sunday Express{