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.
"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
- 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
- The Demigod Diaries - August 14, 2012
- 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.