S1, E4: Four-part thriller about a female detective with dark secrets in her past. 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 does not go to plan. Bancroft is eventually forced to reveal carefully kept secrets about her past, and finally we find out what really happened to Laura Fraser - and why.