Seven sorority sisters, Katey (Katherine McNeil) Morgan (Jodi Draigie), Stevie (Ellen Dorsher), Liz (Janis Zedo), Vicki (Eileen Davidson), Jeanie (Robin Meloy), and Diane (Harley Jane Kozak) pull a prank on their strict house mother, Mrs. Slater, who is known for carrying a sharp walking cane. Their plan is to put Mrs. Slater's cane out in their dirty pool and force her at gunpoint to swim through and retrieve it. The prank goes awry when Vicki, who was holding the gun, accidentally shoots Mrs. Slater. The girls all agree to hide Slater's body in their dirty swimming pool until a graduation party being held in the house is finished. As the party begins, a guest wanders around the pool and an unknown figure stabs him through the neck with Mrs. Slater's cane and drags him away.