The network brings down the curtain on “Bates Motel,” its ambitious prequel to “Psycho,” having taken Norman Bates from harmless-seeming youth to killer who dissociates from reality so often it’s impossible to tell which personality is the true one. Kerry Ehrin and Carlton Cuse, who created the show with Anthony Cipriano and wrote the final installment, serve up a finale that is dark and decisive, but also reflective.

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