A magnificent stripping down of crime-thriller cliché, taking that Silence of the Lambs streak of Our Serial Killers Are Geniuses narrative and showing it for the myth that it is - Weaver and Hunter form a female duo that must navigate sexist cops and incompetent case work. The on-paper setup sounds basic enough, and while the plot is always active and easy to convey and retell, it is in the showing of a lot of Weaver's mental state that the movie excels - her agoraphobic fits are wonderful operations of pure cinematic language, the way the camera will creep from objective eye-level reporting into twisted Dutch angles is perfect.
As a product of the mid-90s, Copycat gambles a lot on its prediction of what the emergent thing that was to become The Internet would be. Surprisingly, it gets a lot right.
What can I say, way ahead of its time, worth popular and critical re-examination.