The Case of the Fun House Mystery (1995)

Overview

Something is making scary noises inside the fun house at an amusement park, and the girls must figure out who or what it is. Using the clue of "Monster Mush" and "bananas", they find out the monster lurking inside the fun house is really an orangutan. (The trip to Tons-Of-Fun was about 1,379 miles from their attic)