Mallory Kass has written at least 1 book. Their most popular book is The Black Book of Buried Secrets with 4 saves with an average rating of 5⭐.
Series
7 primary books8 released booksThe 39 Clues is a 8-book series with 7 primary works first released in 2008 with contributions by Rick Riordan, Gordon Korman, and 3 others.