This book is third in the "Heroes of Olympus" series.
The 3rd in a series of 3 so far, The Mark of Athena demonstrates the combining of two books into one perfectly. The first two, The Lost Hero and Son of Neptune, are joined at last in the amazing 3rd book. You could probably read this book before the other two, but you would be lost in some parts of the story. If you think this is the end of the series, you're wrong, but it will answer a lot of your questions. The reunion of Annabeth and Percy; confusion between Hazel, Frank, and Leo; and many other things will occur. Annabeth's own little quest, and figuring out what happened to Nico will occur in the story as well as trying to stop Gaea from awakening. While traveling to the original Rome on the Argo II, you will hear about old enemies, new friends, monsters, gods, and all sorts of other amazingly described occurrences. Narrated by 4 of the 7, you will have much fun reading this book.
