AllMovie

Real-life sisters Misty Mundae and Chelsea Mundae are cast as sinister siblings in this tense erotic thriller. Cynthia (Misty Mundae) and Morgana (Chelsea Mundae) are sisters who attend the same private school. Cynthia is a rebellious "bad girl" who does what she pleases with little concern for the consequences, while Morgana is a stuffy and repressed bookworm, though her own searing desires simmer below the surface. After Morgana loses out to Cynthia after they flirt over the same man, she is caught in an embarrassing situation by one of her rivals, Beth (Andrea Davis). When Beth informs Morgana that she can see to it that her prized academic scholarship is taken away, Morgana snaps and murders Beth. Morgana calls upon Cynthia for help as she heads out to hide the body. However, Morgana's problems are just beginning when, after a row with her sister, she's kidnapped and held captive by a mysterious woman named Juli (Julian Wells. Sin Sisters was also released under the title Wicked Sister.