As monsters walk the streets of San Francisco, unseen by humans, three teenaged descendants of Medusa, the once-beautiful gorgon maligned in Greek mythology, must reunite and embrace their fates.

Triplets Gretchen, Grace, and Greer, descendants of Medusa, continue to battle the monsters who walk the streets of San Francisco, unseen by humans, but realize they must enter the abyss if they are to protect their loved ones--and their world.

Priding herself on having the most up-to-date information about everyone at Mount Olympus Academy, gossipy Pheme sends VIP messages that linger in cloud letters above her head, a habit that raises the ire of her fellow goddesses.

Jason, Piper, and Leo, three students from a school for "bad kids," find themselves at Camp Half-Blood, where they learn that they are demigods and begin a quest to free Hera, who has been imprisoned by Mother Earth herself.

After becoming the Furies of Greek mythology, three angry high school girls take revenge on everyone who deserves it.

Fourteen-year-old Jack Perdu, a prodigy of classical mythology, suffers a near-fatal accident after which he meets Euri, a young ghost who introduces him to New York's ghostly underworld, eight levels below Grand Central Station, where Jack decides to look for his mother who disappeared years earlier.

Orpheus, a mortal rock god, asks Persephone to help him get the love of his life, Eurydice, back from the underworld, and Persephone agrees to enlist Hades help after she is voted most dependable by her friends, a label she doesn't want to have.

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.

In this story with a modern twist, Hades tells his own version of how he became King of the Underworld and Zeus became King of the Gods.

Percy Jackson & the Olympians series, bk.3. When the goddess Artemis disappears while hunting a rare, ancient monster, a group of her followers joins Percy and his friends in an attempt to find and rescue her before the winter solstice when her influence is needed to sway the Olympian Council regarding the war with the Titans.