"Son of Neptune" is the second book in Rick Riordan's series of Roman adventures about unusual demigods and desperate quests. In this book, the main character, Percy Jackson, loses his memory and finds himself in a summer camp for demigods of Roman origin. Together with his new friends - Heroina and Frank - he goes on an incredible journey through the USA, where they will be tested by gods, monsters and himself. This gripping book about friendship, bravery and inner battles will captivate young and old adventure fans alike.