Percy, Annabeth, Piper, Jason, Frank, Leo and Hazel are off on another journey aboard the Argo II in Rick Riordan’s third installment of The Heroes of Olympus series.  With the angry Roman campers from Camp Jupiter hot on their tails, the seven demigod friends race across the United States to find clues and any support that will stop Gaea from awakening and taking over.  Athena has given Annabeth another task which is not known by the rest. Follow the mark of Athena. Avenge me.