Aired: September 25, 2000 | Season: 3 | Episode: 17

Overview
Runtime: 30m
Directed by: Koyalee Chanda
Written by: Adam Peltzman
Description
There's somebody building a fort in the backyard of the Blue's Clues house, but we have no idea who it is. In this episode, we put on our detective caps and logical-thinking skills. There's a mystery to be solved. Come along as we investigate, with a little help from Mr. Salt and all of our friends.