Tiril, Oliver and Grandpa Franz travel to Mongolia to collect a valuable statue called The Blue Dragon. The journey unfolds like a carefully planned puzzle. Along the way, they discover that a man disguised as Grandpa Franz has arrived before them.

A thrilling race begins, through villages, over fields and mountains, past hidden signs, secret symbols and strange riddles. The reader follows along every step of the way. The Search for The Blue Dragon is the sixteenth activity book in the Detective Agency No. 2 series. Find the traces, solve the codes and follow the clues. The solution is hidden in the texts and illustrations!