This summary describes the plot of the book "Who Moved My Cheese?" by Spencer Johnson. It tells the story of two mice, Sniff and Scurry, and two little people, Hem and Haw, who live in a maze and search for cheese. One day, they discover the cheese they usually find is gone. The mice quickly go search for new cheese, while the little people, especially Hem, struggle to accept the change and want to understand why the cheese moved. Eventually Haw decides to search for new cheese as well. The book uses this story to teach lessons about accepting and adapting to change.