4.5 stars.

A good follow up to The Lightning Thief. Riordan does a good job introducing the characters and history for those who haven't read the first book without it being overbearing. I love the comic relief that he weaves throughout the stories that keeps things light and fun. The story moves fast and the characters are growing a little in depth. There are some moral lessons to be learned in addition to the bits of Greek mythology. I am really enjoying this series and finished this one in a single day. On to the next one!