Commander Clare Blake must deal with the possibility that the man she arrested years ago, who is out on parole, might be responsible for another murder.

Blake and Hampton take their relationship to the next level, as the team investigate a police shooting; DCI Hedges and his crew find themselves under the spotlight as Blake gets to the bottom of the mystery.

Commander Blake continues to struggle with the impact of the James Lampton case. She is told that she is required to testify about personal details in court, and also learns that she is being stalked.

Blake's terminally ill sister moves in with her. Meanwhile, a hacker terrorises a local hospital with threats to kill one patient every 24 hours if his ransom demands aren't met.

Constable Blackton investigates a police shooting and Blake's sexual relationship with serial killer James Lampton.

Blackton is determined to dig up the truth and the corruption surrounding Commander Blake. Meanwhile, Blake's investigation is compromised.