There were 7 demigods (Half gods) on a mission to save the world.
They finally arrived but Annabeth one of the main characters picked up a rock and then got attracted by a statue. She then wandered through Rome by herself.
These 7 demigods were saving the world from mother earth (Gaea). Gaea is the mom of all the Giants who invade territories of the gods. There are two camps full of demigods in hiding from the giants and Gaea. Which are both hidden cities.
These 7 Demigods were off to Rome to the doors of death and open them to stop all of the monsters from not dying.
When they were near Rome they got stopped by a sea monster. This sea monster was so powerful that it could take on 7 demigods all with special powers.
Read more to find out more details and what happens next!