Instead of Camp Half-Blood doing a school year and going home for summer like it happens at Hogwarts, it's the other way around. I liked the idea of going home even after all the danger like how it ended in the first book. During the school year, not seeing Grover or Annabeth for a while, Percy has befriended a gentle giant named Tyson. Everybody except Percy seems to hate him and sees him as a giant orphan who lives in a cardboard box that he is, but I feel in reality, everyone would want to be his friend. He's unbelievably loyal and sensitive about everything. On the last day of school, they are both attacked, and they need to head to Camp Half-Blood which is now under siege by bulls. They get there by unbelievably crazy taxi drivers. Turns out that now, the tree that was planted as tribute to a little girl's death has been poisoned, thereby allowing people into the camp without authorization. Who poisoned the tree? Luke, probably. That's not half of it, though. Grover is out being held by a Cyclops at the Sea of Monsters. Now, two tickets for the price of one, Percy, Tyson, and a reluctant Annabeth go off even though it isn't technically their journey.
Just like the last one, this is a funny thrill ride that keeps control of itself. Some books try too hard to be or not to be funny, and these Percy Jackson books seem to just have natural humour. The movies do too. I enjoyed the conflict between Tyson and Annabeth ending and how they get saved by these adorable sounding sea horses that are so big, one can carry Tyson on it's back. During the brief times of these, it will remind many people of the Hiccup-Toothless relationship. I also liked how instead of training, the events only take place in about four days, I like it when novels do that, it gives them a type of energy. It's not quite perfect, with a little goodbye and a terrific but scattered final ending, but there's really no reason not to like the Percy Jackson books.