Heroes of Olympus - The Mark of Athena by Rick Riordan

Annabeth and her friends Piper, Jason and Leo have landed at Camp Jupiter with one mission in mind. The time has come for Roman and Greek demigods to unite. With Percy Jackson, Hazel and Frank by their side, they must combine forces to find - and close - the Doors of Death.

But Annabeth s hiding a secret - a command from her moher, the goddess of war and wisdom: "Follow the mark of Athena. Avenge me". Annabeth is already risking her life. What more does Athena want her daughter to do?

Now seven demigods must begin their quest across land and sea to Rome, but what will they have to sacrifice this time - and what unspeakable horrors await?

Rick Riordan, dubbed 'storyteller of the gods' by Publishers Weekly, is the author of five New York Times number-one bestselling book series with millions of copies sold throughout the world: Percy Jackson, the Heroes of Olympus and the Trials of Apollo, based on Greek and Roman mythology; the Kane Chronicles, based on Egyptian mythology; and Magnus Chase, based on Norse mythology. Percy Jackson and the Lightning Thief, Rick's first novel featuring the heroic young demigod, won the Red House Children's Book Award and is now a blockbuster film franchise starring Logan Lerman.