Mark of Athena by Rick Riordan

"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."   Two camps.  One Greek.  One Roman. Trying to join together after 1000s of years. The prophcey is in action! 7 half-bloods are sailing to old Rome in a giant Greek warship. (BTW Percabeth is reunited) Anabeth faces her biggest fear, Nico might die, and Pipper is getting nowhere with Jason.  Find out what happens in the latest "The Heros of Olympus" book. GK