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Twenty years ago, Susan Lentigo lost her only daughter, Amy. And since then, all she wants is to get justice. The woman is planning a trip to North Dakota for the execution of the Beast. Perhaps after that, she will finally be able to let go of the past, complete her work with the psychiatrist and "move on". On the way to North Dakota, she stops by the home of a formerly close friend and comes across a key piece of evidence, a coloured necklace that looks like her daughter's. Susan demands a reopening of the case, but the FBI has her on a neurotic list... In order to save two lives and put the real Monster behind bars, Susan decides to investigate the case herself. But will she succeed? And did the necklace she found really belong to Amy?