What book, written by RIchard Riordan, grossed nearly $430 million in the box office when adapted into a series of films?
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.
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