I love Rick Riordan's books, but all the narratives are starting to blend together. You could replace character names with those from Percy Jackson, and it'd be impossible to tell the difference. For example: 
 Randolph shook his head in disgust. 'Those movies ... ridiculously inaccurate. The real gods of Asgard - Thor, Loki, Odin and the rest - are much more powerful, much more terrifying than anything Hollywood could concoct.' 
 'But ... they're myths. They're not real.' 
 Randolph gave me a sort of pitying look. 'Myths are simply stories about truths we've forgotten.' 
 Sound familiar? 
 Replace Magnus with Percy, Randolph with Chiron, and the Norse gods with Greek ones, and the story sounds very much like the beginning of The Lightning Thief. Maybe I'm wrong, but I think it's time for Rick Riordan to put down the topic of gods and adopt something new to write about.