Heroes of Olympus: mark of Athena. Rick Riordan. 2013.

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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 closer- the Doors of Death.

But Annabeth is hiding a secret - a command from her mother, 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 the 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?