In London, Marina tells her mother that she's breaking up with her girlfriend Romy. A long flashback follows: Marina reflects on what led to the breakup and investigates her own psyche. She observes and reports on her friends in their problematic relationships, and she flirts with the idea of sleeping with men again. Meanwhile, Louise, a newspaper columnist, is investigating and writing about the Sapphic impulse. Will these inquiries lead Marina - and Romy and their friends - to insights or to unhappiness? How do we figure out what we want?