For everyone who's still figuring it out.

Sorority Row's killer turns out to be protagonist ... There's a very telling line early in the film, when Andy asks Cassidy why she drifted apart from her sorority sisters after Megan's disappearance.

A group of girls staying at a sorority house clash with the house's owner, who wants them out. They decide to play a prank on her, but it goes awry and she winds up dead. Panicking, the girls try ...

For everyone who's still figuring it out.