The Mark of Athena ( Heroes of Olympus) (Hardcover) by Rick Riordan

The Mark of Athena is a thrilling adventure that unites six demigods from Camp Jupiter and Camp Halfblood in their quest to complete the Prophecy of Seven.

With old friends and new allies joining forces, they embark on a perilous journey across the country aboard a magical ship, facing fearsome foes and uncovering cryptic prophecies along the way.

As they race against time to defeat the Earth mother Gaea and her giant offspring, the demigods must also navigate their complex relationships and personal struggles.

Will they be able to complete the Prophecy of Seven and save the world from destruction? Find out in this unforgettable adventure by master storyteller Rick Riordan.