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The team review a past crime to solve a murder, Perez investigates an old friend's death in a car accident and a scientist is killed at the Fair Isle bird observatory.
- Episode 1: Raven Black - Part 1
- Episode 2: Raven Black - Part 2
- Episode 3: Dead Water - Part 1
- Episode 4: Dead Water - Part 2
- Episode 5: Blue Lightning - Part 1
- Episode 6: Blue Lightning - Part 2
