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Callie and Tilda are very different twins. Callie lives a quiet life, with a menial job, whereas Tilda craves the spotlight, and is a moderately successful actress. Callie is awkward, suffering from a lifetime of acne, weight issues and comparing herself to her sister and her beautiful white body. Callie has very strong feelings for her sister, envy, admiration, anger, love, and Tilda laps all of these feelings up. They are grown, and see each other with relative frequency. But now Tilda has met a new man, Felix. He's smart, charismatic, successful and very intense, very particular. At first Callie loves him, loves the way he includes her in their relationship, but after a boating trip, fun turns into something more sinister, Callie begins to worry about this dynamic, to obsess ...