The Gossip Girl series 1-4 book set by Cecily Von Ziegesar consists of paperback books in English, perfect for young adults and adults alike. Set in the drama and romance genre, this series follows the lives of teenagers in New York City, focusing on topics of lifestyle and relationships. The books are written by Cecily Von Ziegesar and are intended for a young adult audience, providing an engaging read for fans of the genre. This book set is a must-have for those looking for a captivating and heartwarming story.