What book, written by RIchard Riordan, grossed nearly $430 million in the box office when adapted into a series of films?
Rick Riordan: Richard Russell Riordan Jr. ( ; born June 5, 1964), better known as Rick Riordan, is an American author. Rick Riordan:  Twentieth Century Fox has adapted the first two books of his Percy Jackson series as part of a series of films. Percy Jackson (film series): Percy Jackson & the Olympians (also known as Percy Jackson) is an American feature film series based on the novel series of the same name by the author Rick Riordan. Percy Jackson (film series):  The series has grossed nearly $430 million at the worldwide box office.
Percy Jackson & the Olympians