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.

The Devil You Know (Part 2): Commander Blake and DCI Doug James pursue two former patients as suspects in the case, Eric Thornton, a schizophrenic and John Littlewood, a violent drug user. DCI James remains skeptical about the direction of the investigation.