 Meanwhile , Lisa basks in the glow of her new popularity . However , Martin Prince gets a larger pool , and everyone abandons Lisa , leaving her inside the empty pool with no idea of how to get out . After Lisa apologizes to her brother for neglecting him , Bart asks Lisa to go and look for evidence of the murder while Ned is out of the house . When Ned returns early , Lisa becomes trapped in the Flanders house , eventually being cornered in the attic ; Bart painfully makes his way over there by himself , just in time to discover that Ned was actually storing an axe and not using it to threaten Lisa . Maude , as it turns out , is actually alive , and had gone to Bible Camp for the weekend , to learn to be more judgemental . The victim of Ned 's " murder " was merely her favorite plant , and the woman screaming actually came from Ned himself . Meanwhile , Martin 's swimming pool explodes after being full with too many kids , and everyone abandons him , although Nelson steals his bathing suit first . When the episode ends , Martin sadly sings " Summer Wind " to himself as he stands naked in the wreckage of his pool . 
