Katherine and Anya make a determined push to get to the bottom of the Laura Fraser case once and for all, hatching a plan to get the DNA evidence they desperately need. Bancroft plans and executes a massive sting operation against Athif Kamara, but all doesn't go smoothly. Bancroft is forced to reveal carefully-kept secrets about her past, and finally we find out what really happened to Laura Fraser - and why.

Detective Chief Superintendent Elizabeth Bancroft is riding a professional high as a head of a new, merged super force. But her reputation as a "good cop" has come at a huge personal cost. When a disturbing double murder brings her personal and professional life crashing together, she is confronted with a chilling new enemy, and the repercussions of her past actions will return to haunt her in ways she never expected.