What can I say? 
 Just...WOW. If this is going to be a movie, I'll definitely watch this! 
 This series is very addictive.There's happiness, sadness and surprises in this book. Love Thalia, Percy,Grover and Annabeth <3 
 I'm still hooked with Greek Mythology. 
 A MUST READ :) 
 Percy, Thalia, Annabeth and Grover found new half-bloods, Bianca and Nico di Angelo. They don't understand why they kept seeing monsters and they didn't know they are half-bloods. Dr. Thorn (he's a monster) is a big threat to them and Percy finds a way to save the Half-blood siblings with the help of the Hunters and Lady Artemis. 
 Unfortunately, Annabeth was captured/taken by Dr.Thorn. Percy blames himself for putting Annabeth in danger and he knew she's alive. He needs to save her. They went back to Camp Half-Blood with the Hunters then the Oracle has spoken to have their quest.. 
 I will not elaborate further of what happened for their quest. It is for you to find out and I just want to avoid spoilers :)