User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-5164022-20121005181804/@comment-4517591-20121006074146

I think Lost Hero has the best ending out all the books so far. It made the next book really unpredictable and opened the whole Heroes of Olympus series really well. I remember theories were all over the place, no one could really speculate how this series was gonna be written.