I really enjoyed this one. As usual, Riordan hits it out of the park. Apollo is still a fantastic character, even if you know that he would drive you nuts in real life. I'm enjoying him slowly learn about the lives of mortals and demigods, and how it is changing him a bit. New characters were pretty awesome, and I love time spent with Calypso and Leo. The book definitely ends in an interesting place, and I can't wait to read the next one!