A sequel series to Percy Jackson that brings together Greek and Roman demigods in a prophesied quest to prevent the earth goddess Gaea from destroying civilization. The five-book series follows seven demigods—including Percy and Annabeth alongside new heroes like Jason, Piper, and Leo—as they sail aboard the warship Argo II, face giants and ancient enemies, and ultimately must unite the long-divided Greek and Roman camps to save Olympus.
Jason Grace wakes up on a school bus with no memory, flanked by friends he doesn't recognize, and quickly finds himself at Camp Half-Blood with two new companions—Piper and Leo—as they embark on a quest to rescue Hera and prevent the rise of the earth goddess Gaea. The opening of the Heroes of Olympus series introduces new demigods alongside familiar ones and expands the mythology to include Roman traditions.
Percy Jackson wakes up with no memory at the Roman Camp Jupiter, befriends the son of Mars and a daughter of Pluto, and must embark on a quest to Alaska to free the god of death and stop the giant Alcyoneus from raising Gaea. A welcome return to Percy's perspective that expands the series' world while building toward the Greek-Roman crossover. Hazel and Frank are strong additions to the cast.
The Greek and Roman demigod crews finally unite aboard the Argo II and sail toward Rome on a mission to recover the Athena Parthenos before the giants can use it to destroy Olympus, while Annabeth faces a solo quest that has haunted her family for generations. A thrilling crossover entry that brings Percy and Annabeth's relationship to the forefront and ends on one of the series' most shocking cliffhangers.
Percy and Annabeth fight to survive Tartarus—the darkest and most dangerous realm in Greek mythology—while their friends aboard the Argo II race to open the Doors of Death from the mortal side. The darkest installment in the Heroes of Olympus series, requiring Riordan to take his characters to genuinely horrifying places while also including the series' most significant LGBTQIA+ storyline.
The seven demigods of the Prophecy of Seven converge on Athens and then Olympus for a final confrontation with the giants and Gaea herself, while Nico and Reyna race against time to deliver the Athena Parthenos before war between the Greek and Roman camps destroys everything. A satisfying but slightly rushed conclusion to the five-book series.