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Where to watch "Six Four"

4. Episode 4
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Michelle returns to Scotland and accompanies Chris in search of Annabel.

3. Episode 3
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An unexpected visitor confronts Chris with the consequences of Michelle's secrets.

2. Episode 2
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Pauline Wallace receives a ransom call; Chris discovers a link between cases.

1. Episode 1
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DC Chris O'Neill is approached by a journalist about a cold case involving a missing girl.