The series of books featuring a boy with a lightning scar is the "Harry Potter" series, written by British author J.K. Rowling. The story follows Harry Potter, a young wizard, as he discovers his magical heritage, attends Hogwarts School of Witchcraft and Wizardry, and battles the dark wizard Lord Voldemort. The series captivates readers of all ages with its themes of friendship, bravery, and the struggle between good and evil. It has achieved immense popularity, leading to adaptations in film, theater, and merchandise, creating a significant cultural phenomenon.