WHO'S BEEN HANGING OUT IN TODD'S TREE HOUSE? Todd's ears are so clogged up he can't hear, but he doesn't want to miss school. His teacher, the ex-spy Mr. Merlin, is sure to have secret codes for the class to figure out and a new mystery for them to solve. But the mystery turns...
Todd uses clues from earwax and a pink handkerchief in order to discover which of his schoolmates has been in his treehouse.