DC Rachel Bailey, DC Janet Scott and the team take on a new case - a young Turkish woman has been killed, and her murder made to look like suicide. Rachel finds out that the woman's husband was having an affair, and takes a risk when it comes to interviewing the man's mistress. Will her high-stakes approach get results? She also uses her police privileges to carry out an investigation into her own ex - and is horrified to discover that he is married with two children. Meanwhile, Janet agrees to take another look at the case of an old school friend, Veronica, who was abducted and murdered when they were children.

Rachel's personal life gets even more complicated when she reveals to Nick that she is pregnant. At work, the team face a particularly gruesome case - a mother of two has been brutally raped and left to bleed to death in the boot of her car. A sharp piece of detective work from Rachel leads to teenager Luke Farrell being charged, but horrific events start to unravel as a result of his arrest. Janet steps up her investigation into her childhood friend Veronica's death and meets up with an officer who investigated the murder.

When a rape and murder case goes to trial, DCI Gill Murray is determined to see the defendant, Georgios Stelikos, convicted. But the case is made more complicated because only one of the alleged victims is prepared to testify. When Rachel gives evidence, she is horrified to discover that her ex Nick is the defence barrister. Nick's cross examination shakes her when he uses information which passed between them when they were together. But as the verdict is delivered, events take a shocking turn.

Adult movie star Vicky Birkinshaw finds herself being arrested on suspicion of her murdering her husband three weeks after she reported him as having disappeared. Rachel has to go through the woman's home-made pornography collection to look for clues. The case ends up taking a dark twist after Vicky's daughter turns up with an older boyfriend.

When Rachel bumps into an ex-juror, she is shocked to discover that the woman had an affair with Nick in the middle of a trial - and a desperately worried Nick does everything in his power to persuade Rachel to keep the knowledge to herself. After a current investigation throws up similarities to Veronica's murder, Janet tells Geoff Hastings that they could be one step closer to bringing his sister's killer to justice. But when Rachel stumbles across some new facts in the case, she realises that Janet is in terrible danger. Can she get the information to Janet in time?