It became that hot in Springfield it was really difficult to stand it. Bart and Lisa come up with the decision it would be much easier to stand the heat with their own swimming pool. They ask their father to arrange it on the back yard. The swimming pools becomes really popular among other children. While having fun and jumping from the nearby tree Bart accidentally falls and breaks his leg. When it is understood he will spend the whole summer in his room lying in bed Lisa presents him her telescope. Later when watching through the telescope in the neighbor’s yard Bart notices Ned Flanders with the shovel. His own thoughts bring him to the decision that Flanders had killed his wife Maude.