The Heroes of Olympus
The series begins with The Lost Hero, and ends with The Blood of Olympus. Some characters from the Percy Jackson & the Olympians series return, including Percy Jackson, Annabeth Chase, Clarisse, Chiron, Camp Half-Blood campers, and several others. There are also some new characters. Some are Leo Valdez, son of Hephaestus, Jason Grace, son of Jupiter (Zeus as a Roman) and Piper McLean daughter of Aphrodite and movie star Tristan McLean who is kidnapped in The Lost Hero.