The Mark of Athena - Wikipedia, the free encyclopedia en.wikipedia.org/wiki/The_Mark_of_Athena The Mark of Athena is the third installment of The Heroes of Olympus series written by Rick Riordan. It was released on October 2, 2012. The book takes place where The Son of Neptune left off. The novel follows the alternating third-person narrative style of the previous two books, with narration cy