by Rick Riordan
Part of Percy Jackson and the Olympians, book 4.5
First published 2009
Percy Jackson receives an urgent summons to the Underworld from Persephone herself. The goddess has called Percy, along with fellow demigods Thalia and Nico, for a critical mission. Hades' powerful sword has gone missing, and dangerous forces threaten to claim it. The three young heroes must navigate the treacherous realm of the dead to recover the weapon before it reaches the wrong hands. Percy finds himself working alongside Thalia, daughter of Zeus, and Nico, son of Hades, creating an unlikely alliance between the children of the Big Three gods. Time runs short as they race through the Underworld's dark passages and face supernatural threats. The stakes couldn't be higher, as failure would leave one of the most dangerous weapons in Greek mythology vulnerable to misuse. This adventure tests not only their individual powers but their ability to work together when the fate of both mortal and divine worlds hangs in the balance.
Genres: mythology, adventure, fantasy, young-adult
Vibes: fast-paced, suspenseful, thought-provoking
Tropes: found-family, unlikely-allies
Setting: Underworld
Period: Ancient Greece
72 pages · Mass Market Paperback · Puffin Books