When the teacher announces the Lend-a-Hand Contest to help the war effort, Molly is determined that the third grade girls will plan the winning project. Instead, they choose an idea that Molly knows will never work out. So she talks two friends into planning their own project and keeping it a secret from the rest of the girls in the class. But Molly's project turns out to be harder than she thought it would be. Molly begins to worry that her project might not win after all and decides to spy on the other girls to see how they are doing. When Molly and her friends get caught peeking in through a window, they learn some important lessons.