It is a windy autumn day on Sesame Street, and Chris, Elmo, and Rosita hear Stinky calling from underneath a pile of leaves. They dig him out but he says that it will just happen again since he gets covered with leaves every single day. Rosita suggests that they try to figure out which tree the leaves are coming from by taking a leaf that fell on Stinky and comparing it to leaves on some of the surrounding trees to find a match. So the leaf detectives start their investigation by counting the points on their leaf and comparing the color, shape, and size with other leaves until they find one that looks the same. When they discover which tree the leaf came from, Leela and Chris explain that the tree is deciduous, which means it will lose its leaves every fall and grow them back every spring. Since Stinky doesn't want to move, they all think of ways that they can protect him from the falling leaves. First Elmo and Rosita try an umbrella, but Stinky explains that it's not good since it blocks the sunlight. Then they try a big clear bowl that will let in the sunlight, but Stinky tells them that it will keep out the raindrops that he needs. Then they spot some mosquito netting that will let sunlight and rain through but keep the leaves out. Using the netting, small tools and some wood, they build the perfect covering for Stinky and solve the problem! He is so happy that he has such great friends to help him.