The novel begins with Percy Jackson being pursued by gorgons. Percy has had a rather bad week – he can’t remember anything about his past except for his name and a girl named Annabeth. He is being hounded by monsters from mythology, and he has to get Camp Jupiter for safety. When he finally arrives at Camp Jupiter, he still doesn’t know if he’s actually safe since he is met with suspicion. His abilities clearly mark him as a son of Neptune, who isn’t exactly a favorite among the Romans. He quickly makes friends with two of the other misfits in the camp – Hazel, a daughter of Pluto, and Frank, who is still unclaimed though his 16th birthday has passed. Hazel has secrets about her past that she is hiding, and Frank is still grieving for his mother, a Canadian soldier that died in Afghanistan.