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Where to watch "Six Four"
4. Episode 4
No release date yet
Michelle returns to Scotland and accompanies Chris in search of Annabel.
3. Episode 3
No release date yet
An unexpected visitor confronts Chris with the consequences of Michelle's secrets.
2. Episode 2
No release date yet
Pauline Wallace receives a ransom call; Chris discovers a link between cases.
1. Episode 1
No release date yet
DC Chris O'Neill is approached by a journalist about a cold case involving a missing girl.
