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
• Percy Jackson: Greek demigod and son of Poseidon
• Hazel Levesque: Roman demigod and daughter of Pluto
• Piper McLean: Greek demigod and daughter of Aphrodite
• Frank Zhang: Roman demigod and son of Mars
• Leo Valdez: Greek demigod and son of Hephaestus
• Unknown

Books

Main Series

• The Lost Hero – October 12, 2010
• The Son of Neptune – October 4, 2011
• The Mark of Athena – October 2, 2012
• Book 4 – Fall 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.

Gallery

Cover of The Lost Hero

Cover of The Son of Neptune

North American cover of The Mark of Athena

Australian cover of The Lost Hero

UK cover of The Son of Neptune

UK Cover for The Mark of Athena

Cover of The Demigod Diaries

Indonesian cover of The Lost Hero

Indonesian cover of The Son of Neptune

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