Uniting with Jason, Piper and Leo after the dangerous quest in "The Son of Neptune," Percy, Hazel and Frank wonder who will be chosen to fulfill the Prophecy of Seven, completing their group's number, and sail with them to an ancient land to find the mysterious Doors of Death.

Born of a mortal woman and the king of the gods, Hercules is blessed with extraordinary strength. The goddess Hera commands that the mighty Hercules must undergo twelve incredible tasks to pay for a mistake he made in the past. Hercules easily completes the first few labors, as he overpowers a ravenous lion and battles a giant bull barehanded. But not all the gods support him, and Hercules faces difficult tasks that test his strength and his mind....

Greek and Roman demigods from the Prophecy of Seven must work together to seal the Doors of Death--and help Percy and Annabeth escape the Underworld in the process.

Relates the adventures and exploits of the legendary hero, Hercules

Reborn as the Flame, thirteen-year-old Emily has saved Olympus from destruction, but when the gruesome Nirads begin a new invasion, Emily and her friends become entangled in the conflict as old grudges are unearthed and new enemies are discovered.

"Greek and Roman demigods from the Prophecy of Seven must work together to seal the Doors of Death--and help Percy and Annabeth escape the Underworld in the process"--