I highly recommend The Son of Neptune. 
 ***** 
 Percy frowned. "You hold a feast for tuna?" 
 RIDICULOUSLY FUNNY. 
 The Son of Neptune first captivated me with that oh-so-cool cover (Percy is so bad-ass!), then i started reading... and man, i really miss Percy Jackson!!! He now thinks before he speaks, he became perceptive, and he is more powerful than before. Rick Riordan, thank you for making Percy Jackson grow up. I love him now more than ever. =) 
 Percy is in Camp Jupiter, gaining new friends like Hazel and Frank, and enemies as well, like Octavian. They embarked on a quest that will push them to discover their potentials as they become the demigods included in the Prophecy of Seven. Riordan took a story pattern similar to The Lost Hero but this sequel is hands down more fun and engaging! I admit that i can't wait to read those chapters with Percy's POV (Hazel's & Frank's are not as entertaining as Percy's), so imagine my glee every time I read his chapters - loads and loads of humor! Despite Percy's memorable deadpans, it is obvious that here is a demigod who has the wits and the moves that can topple down any monster or giant Gaea will throw at him. I will say this again: Percy is a (demi)GOD! 
 Although there are few inconsistencies that i found, I did not mind them much. I enjoyed the The Son of Neptune because it is such a feel-good book! Riordan got me laughing and laughing all throughout. I really like Mars far more than Ares. Arion is one indignant horse, err, stallion. LOL 
 Are you a fan of Percy Jackson? If yes, then better grab a copy now! You would want to know how Terminus (the boundary god) had me LMAO every single minute! If no, well then, it's about time you meet the greatest demigod there ever is. After all, he is the son of Poseidon (or Neptune, whatever).