"The Secret Series" is a collection of children's books written by Pseudonymous Bosch. The series follows the adventures of a group of friends who uncover hidden secrets and solve mysteries. Each book is filled with puzzles, riddles, and engaging storytelling that encourages readers to think critically. The series consists of five main books, starting with "The Name of This Book Is Secret." The narrative is unique, often breaking the fourth wall and directly addressing the reader. Themes of friendship, bravery, and curiosity are prevalent throughout, making it an enjoyable read for young audiences.