After Allie Jones throws out Sam, her sexy but two-timing live-in lover, she desperately needs someone to split the rent on her Upper West Side New York apartment. And if anybody seems a safe bet, it's shy and unimposing Hedra Carlson, the least likely candidate for leaving dirty socks on the floor. Yet there is something od about the way Hedra openly envies Allie's appearance and lifestyle. Then Allie begins receiving obscene phone calls from strangers who know her name ; her credit cards mysterously disappear and she is shocked to discover that Hedra's wardrobe is eerily similar to her own. Unknown to Allie, her plain and modest roommate is sharing much more than the rent and a bloody nightmare is beginning ...