Todd and Noelle use the detective skills they learn from their new teacher Mr. Merlin to figure out who sent a classmate an anonymous letter and find out who ha

Todd uses clues from earwax and a pink handkerchief in order to discover which of his schoolmates has been in his treehouse.

With the help of their third-grade teacher and classmates, Noelle and Todd discover who sent an anonymous letter to Amber Lee.

Can the Third-Grade Detectives crack a case without Mr. Merlin?