by CG FEWSTON February 1, 2014 Fiction Pictures The 39 Clues (2008) by Rick Riordan The 39 Clues (2008) by Rick Riordan is a mystery/action-adventure series for young teens and is quite a fun and insightful read. Share the knowledge:Tweet Share on WhatsApp (Opens in new window) WhatsApp More Share on Telegram (Opens in new window) Telegram Share on Reddit (Opens in new window) Reddit Share on Tumblr Print (Opens in new window) Print Email a link to a friend (Opens in new window) Email