Blackdog (Part 1): Patient and persistent, Deputy Chief Constable Stephen Blackton (David O'Hara) has earned his nickname, "Blackdog," as he is called in to re-open the investigation of the Lionel Cripps shooting.

Blackdog (Part 2): After Graham Warner, the officer implicated in the Lionel Cripps shooting, is found dead in a park. Commander Blake continues to bury evidence of her relationship with James Lampton.

Blacklight (Part 1): A young woman disappears from a nightclub, and a mental patient, Reginald Aitken (Nickolas Grace) escapes from a hospital. Hours later, the two are found together covered in her blood.