Plot: During a party in the Theta-Pi sorority house, the sister Megan plays a prank with her unstable boyfriend Garrett simulating an OD after using pills. Her sisters Jessica, Claire, Ellie, Cassidy and Garrett's sister Chugs suggest to dump her "body" in a lake and the stressed Garrett sticks the tire iron through the Megan's chest killing her. Cassidy decides to call the police, but the sisters are convinced to dispose the body in a shaft and keep in secret under the leadership of Jessica that blackmails Cassidy. Eight months later, in their graduation party, the sisters receive a creepy message with the picture of the tire iron in the beginning of a nightmarish night.
Alternative Plot: Cassidy (Briana Evigan), Jessica (Leah Pipes), Ellie (Rumer Willis), Claire (Jamie Chung) and Megan (Audrina Patridge) are sorority sisters and true-blue friends to the end -- until a prank gone wrong results in Megan's demise. Rather than risk their futures by reporting the crime, the friends agree to cover it up. Cassidy and company come to regret the decision a year later when someone begins sending them videos of the night Megan died, and they fall victim to a deadly stalker.
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