Heroes of Olympus | The Mark of AthenaThe Mark of Athena is the explosive third part in Rick Riordan's number one series Heroes of Olympus. ONE FATAL PROPHECY SEVEN BRAVE DEMIGODS A QUEST TO FIND AND CLOSE THE DOORS OF DEATH. Annabeth felt as if someone had draped a cold washcloth across her neck. She heard that whispering laughter again, as if the presence had followed her from the ship. She looked up at the Argo II. Its massive bronze hull glittered in the sunlight. Part of her wanted