In "The Lightning Thief," a novel by Rick Riordan, the protagonist Percy Jackson discovers he is a demigod, the son of Poseidon. Throughout his journey, he faces numerous challenges, including battles with mythological creatures and the pursuit of a stolen lightning bolt. Along the way, he learns about friendship, loyalty, and courage, as he teams up with other demigods to prevent a war among the gods.

The book effectively illustrates themes relevant to young readers, such as identity and acceptance, particularly in regard to Percy’s struggles with Attention Deficit Disorder (ADD). Riordan portrays Percy's abilities in a positive light, emphasizing that his unique traits can be strengths rather than weaknesses. This helps convey an important message about embracing differences.