in this book percy had dreams of this best friend in trouable. then he found a that his other friend in school was a cyclops! the cyclops saved his life many times.at the last day of school, there was new kid that came to the school and at gym percy found out that they were really monsters. they were playing monster dogeball. there was inferno fire balls hits everywhere in the floor. since the mortals cant see monsters but they can see what they want they couldnt see that the kids were monsters then percy was lookign for this pen and he couldnt find it his friend the mini cyclops saved him from gettign hit and this happened many times before they came to camp half blood. there was a terriable problem in the camp. they camp's borders were destroyed! monsters were invading the camp all the time. the safest place for the half bollds was no gone! now its up to percy and his friends to save the camp. along the way percy discovers a defining secret about the relasionship of the cyclpos and him! find out what by reading this extrodinary 2nd book! i recomend this book as much as the 1st book "the lighting theif"