Ghosted by her hunky twentysomething lover, Claire (Binoche–balancing cunning and vulnerability), a middle-aged professor and single mom, creates a fake Facebook profile to do a little undetected online snooping. But when her 24-year-old avatar “Clara” is friended by her ex’s equally attractive roommate (François Civil), superficial correspondence quickly escalates towards intense intimacy and uncontrollable obsession. Adapted from Camille Laurens’ best-selling novel–and co-scripted by Julie Peyr, a regular collaborator of Arnaud Desplechin–Who You Think I Am blends genres and bends reality to dizzying effect.

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