I really liked this book and I am definitely looking forward to the next one in the series. 
 I loved the characters, Percy was so funny and cheeky. And the gods were a good surprise too. I liked how Hades and Poseidon turned out. I recommend this book to everyone, but I think mostly younger readers could benefit the best from it. 
 Why did I put only four stars, you may ask. Well, I had only one problem with the story. And it wasn't a big problem, but I found it a bit annoying. I do not want to spoil the story for you, so if you did not read this book yet do not read further. 
 SPOILERS! 
 Ok, my problem was about the repetition of the same situation over and over again. Firstly, they get to this burger-place with creepy statues everywhere, and they do not think twice when a woman with a covered face opens the door. I knew, this was not going to be good. And it didn't. Then, they go up the arch with a woman and her chivava. I could tell, this was not a good idea. Also, I was saying to myself "what are they going on site-seeing when they do not have much time and all that... this does not make much sense" Of course, it was a bad idea to go up the arch. Then, they go in this casino and think they just stay a little... well I knew that was not a good idea either. 
 Ok, I stop rumbling. I understand that these events were all temptations that they had to resist and as our protagonists are children, they could not resist any of them. So, it makes sense. I just did not like that it was so predictable. 
 To finish this on a positive tone: I want to put here a quote I found super funny: