The Heroes of Olympus is Rick Riordan's second series after the Percy Jackson and the Olympians series, and focuses on Greek-Roman mythology instead of only Greek mythology like its predecessor series.

The Prophecy of Seven

"Seven half-bloods shall answer the call,

To storm or fire, the world must fall.

An oath to keep with a final breath,

And foes bear arms to the Doors of Death."

The Seven Heroes of Olympus

• Jason Grace: Roman demigod and son of Jupiter. 
• Piper McLean: Greek demigod and daughter of Aphrodite. 
• Leo Valdez: Greek demigod and son of Hephaestus.
• Percy Jackson: Greek demigod and son of Poseidon. 
• Frank Zhang: Roman demigod and son of Mars and legacy of Poseidon.
• Hazel Levesque: Roman demigod and daughter of Pluto.
• Annabeth Chase: Greek demigod and daughter of Athena.

Books

Main Series

• The Lost Hero – October 12, 2010
• The Son of Neptune – October 4, 2011
• The Mark of Athena – October 2, 2012
• The House of Hades – October 8, 2013
• Book 5 – Fall 2014

Companion Books

• The Demigod Diaries - August 14, 2012

Audiobooks

• The Lost Hero was made available as an audiobook read by Joshua Swanson on October 12, 2010, with a play length of 16 hours and 34 minutes.
• The Son of Neptune was made available as an audiobook, read by Joshua Swanson, on October 11, 2011 (a week after the release of the book), with a play length of 13 hours and 27 minutes.
• The Mark of Athena was made available as an audiobook read by Joshua Swanson on October 2, 2012, with a play length of 15 hours and 9 minutes.

Trivia

• So far two Gigantes have appeared in each book.
  • The Lost Hero - Porphyrion and Enceladus.
  • The Son of Neptune - Polybotes and Alcyoneus.
  • The Mark of Athena - Otis and Ephialtes.
• The Lost Hero is the only book so far in the series where one of the two giants that appears in the book lives (Porphyrion).

Gallery

Cover of The Lost Hero

Australian cover of The Lost Hero

Indonesian cover of The Lost Hero

Cover of The Son of Neptune

UK cover of The Son of Neptune

Indonesian cover of The Son of Neptune

North American cover of The Mark of Athena

UK Cover for The Mark of Athena

Indonesian cover of The Mark of Athena

Cover of The House of Hades

UK cover of The House of Hades

Cover of The Demigod Diaries

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