Jason, Piper, and Leo, three students from a school for "bad kids," find themselves at Camp Half-Blood, where they learn that they are demigods and begin a quest to free Hera, who has been imprisoned by Mother Earth herself. Interest Level: 5-8 Reading Level: 4.5 ATOS Book Level: 4.5 AR Interest Level: MG AR Points: 19 AR Quiz: 140427EN Reading Counts Level: 3.8 Reading Counts Points: 26 Lexile Measure: 660 Iowa Teen Award 2014 - 15.