This was a really good book! I decided to read this, because this is narrated by Percy Jackson, (Or Rick Riordan ) and he has a really good sense of humor. He's not annoying funny, and he's sarcastic, but not mean sarcastic. Plus, I read all the Percy Jackson books, and I also read Greek Gods. So in this book, it's not exactly a narrative, it's not a story. It's more of a guide. I don't even know what I just wrote. So in this book, Percy Jackson comes back to tell us about 12 of the most brave and strong Greek heroes, such as Cyrene, Otrera, Perseus, Psyche, Jason, and Heracles. I actually just listed my favorite heroes right there. This book answers so many questions, such as, who cut off Medusa's head? Who was raised by a she- bear? Who tamed Pegasus, and so many more! Sometimes, it actually seems like Percy's reading your mind. I know that, but I can't remember what he said when he did it, and I'm not going back to the book just to read it all over again. I'm not sure if it'll teach you anything, but it's definitely a good read, which you can read over and over again. I rate this a 5 out of 5, and I recommend it to kids and tweens ( or teens ) ( Maybe adults? ) who like mythology, a bit of Geography, and funny... stuff!