This story continues with Percy Jackson and Camp Half-Blood, but with a dash of Roman Mythology. After The Lost Hero, Jason figures out that Percy has to be at the Roman version of Camp Half-Blood. As Percy tries to figure out his past, Frank is given a quest by Mars and picks Hazel and Percy to be his companions. During this quest, the three become close friends while trying to save their Roman Half-Blood Camp.

The best thing about Riordan's series is the way he writes the Greek Gods and Greek Mythology. The Greek Gods typically are depicted as self-serving and victims to their human flaws. For example, Zeus falling victim to lust, or Athena falling victim to her quest for knowledge. Riordan does not attempt to doll up the Greek Gods, Hera is still a vengeful and vindictive Goddess, especially towards the illegitimate children of Zeus, and Ares is still an ill-tempered impulsive God, which results in The Heroes of Olympus being so hilarious. As the demigods hear of Hera's kidnapping and have to help her, each demigod is reluctant since most demigods have either almost been killed by her or had a nasty run-in with the Goddess.

However, despite the reluctance, the demigods are forced to either follow Hera or take Gaea's offer and not fight with the Greek Gods. This is interesting since a majority of these demigods do not have a good relationship with their parents. The nonexistent bond between the demigods and their parents is something that Gaea plays on, giving these demigods a way out of their relatively short, violent lifespan. It's shown when Percy finds out that Roman demigods are living happily into their mid-thirties. It is shocking for him to think of living to an older age, given that most greek demigods live short lives.

Either way, the journey of Percy Jackson is always a fascinating one, especially with the new characters. One of the most exciting aspects of this series is these demigods having to save their powerful parents despite being absent most of these demigods' lives.