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.

Blacklight (Part 2): Dutch DI Count Eric Van Hauten offers to help DCI Hedges with a new murder case. Commander Blake pledges to remain uninvolved, but will she be able to as the threat of more victims increases?

The Devil You Know (Part 1): Commander Blake clashes with the drug squad and the preserved body of a two-year-old child found at an abandoned mental hospital remains a mystery. Blake is accused of having blood on her hands.