This collection of Hardy Boys books includes titles 21-30 in the series, written by Franklin W. Dixon. The books are in hardcover format and are published by Grosset & Dunlap. The original language of the books is English and they were published in 2020. The books are part of a collection/box set and are new in packaging. The genre of the books is mystery and the topic is books. The books are published in China and are perfect for fans of the Hardy Boys series.