The product is a collection of four books from the series "The Trials Of Apollo" by Rick Riordan. The titles of the books are "The Hidden Oracle", "Dark Prophecy", "The Burning Maze", and "The Tyrant’s Tomb". Published by Hyperion Books for Children, these young adult novels fall under the fantasy genre with a mystery topic. The series is set in the United States and written in English, making it an engaging read for young readers who enjoy adventure and fantasy stories.
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