A young prostitute, Angela Dutton, plunges to her death from the eleventh floor balcony of a block of flats. The police begin a murder inquiry and discover that she was the daughter of a seventies TV star who was also found murdered twelve years earlier, wrapped in blue eiderdown. The killer was never found. D.C.S. Walker heads the investigation into the two murders, with the aid of D.C.I. Connor and the rest of the team. They investigate to find out why Angela Dutton died - did she find her mother's killer, or did one of her three high-paying clients kill her?

The aftermath of Gary Webster’s suicide begins – a DPS enquiry, a very shaken Palmer, and a shocked but stoic Gemma, still convinced of a cover-up at the hospital. Gary wasn’t the killer; all he ever wanted was a straight answer. Adrian Lawson offers a video recording of Amber’s surgery, showing that it was purely straightforward procedure, nothing untoward. His helpful nature doesn’t convince Connor, noting that he wouldn’t have given them something that might implicate either him or the hospital. In any case, Amber died in the ICU, six hours after the surgery. To get to the truth, they need to go back to whoever was in the ICU that night. Walker is unhappy about what he sees as his team wasting their time investigating hospital negligence, when Carlisle’s killer has still not been found. However, Connor is convinced of a connection between his murder and the death of the Webster’s little girl. Connor’s hunch nags at Walker and he pays a discreet visit to Gemma Webster. Promising that the police are investigating the case fully and properly, and revealing that Carlisle was killed with a massive overdose of fentanyl, he asks her once more if she has any information she hasn’t revealed so far. Gemma says nothing. With the spotlight of suspicion now falling on Lawson, Walker questions the Lawsons again. Adrian expresses shock and surprise when told that he was being implicated in Amber’s death. Adrian’s loyalty to his former boss and mentor starts to fade as, seething, he suggests that Walker look at what Carlisle was up to that night…

When a girl falls to her death from a ferris wheel, it is thought to be a tragic accident - until DS Satchell's aunt comes forward with suspicions of foul play.

D.C.S. Walker goes on leave back to Glasgow, where he is taking care of his increasingly senile mother, he soon becomes involved in the case of a missing woman, who is the sister of an old friend. Walker begins to delve into the life of her then husband Kevin Reid, and discovers a dark bond between him and his brother Ronnie. Soon a body is discovered and is it is proved to be the missing woman. Then Kevin's second wife is reported missing - convincing Walker that one or both of the Reid brothers are involved in the crimes.

A young prostitute, Angela Dutton, plunges to her death from the eleventh floor balcony of a block of flats. The police begin a murder enquiry and discover that she was the daughter of a seventies TV star who was also found murdered twelve years earlier, wrapped in blue eiderdown. The killer was never found. D.C.S. Walker heads the investigation into the two murders, with the aid of D.C.I. Connor and the rest of the team. They investigate to find out why Angela Dutton died - did she find her mother's killer, or did one of her three high-paying clients kill her?

Despite the presence of Tess, the police find the funfair workers unwilling to cooperate. An arrest is eventually made, a Romanian worker called Pavel, who had actually gone out with the girl who fell from the Big Wheel, but he is not the murderer. The big question still remains as to the part the development company may have played in the deaths at the fair.

A fifteen year old girl goes missing and her blood-stained clothes are found. Det. Supt. Walker heads the investigation into her murder. Meanwhile, D.I. North is sent to see a persistent complainer, Warrington, who has been hounding the station. North begins to get stalked and Walker has a prime suspect for the murder. But then they find a connection between Warrington and Walker's prime suspect.

Imogen's mother makes a plea for her daughter's safe return. Things happening between McGill and Connor threaten the investigation.

A fifteen year old girl goes missing and her blood-stained clothes are found. Det. Supt. Walker heads the investigation into her murder. Meanwhile, D.I. North is sent to see a persistent complainer, Warrington, who has been hounding the station. North begins to get stalked and Walker has a prime suspect for the murder. But then they find a connection between Warrington and Walker's prime suspect.

D.I. North re-investigates an eight-year-old murder case and finds that Det. Supt. Walker was in charge of the inquiry. She begins to suspect that he's covering something up and he is suspended from duty. He returns to his roots to find new evidence to prove his innocence, in order to save his career, relationship and reputation.

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A young school girl is raped and murdered, but D.C.I. Connor still has no leads a month into the investigation. When Walker orders a review of unsolved cases, they turn up similar cases of raped and murdered teenage girls over the last ten years, and they find themselves searching for an apparent serial killer.

When well-known paediatric surgeon Jonathan Carlisle is found dead, DCI Connor uncovers conflicts stirred by a recent operation that resulted in a young girl's death. The team soon learn that the girl's father, Gary Webster, was the subject of a restraining order issued by Carlisle, and had been stalking him for months. But before he can be questioned, Webster absconds. After a tense game of cat and mouse, the police corner Webster at the zoo - but what will be the outcome of the stand-off?

Whilst Anna's diary entries initially suggest that Ronnie was stalking her, they are eventually dismissed as forgeries. Ronnie also had an alibi for the time that Margaret went missing and it looks as if he is being framed, possibly by his brother, with whom there is an explosive showdown at a race course.

A severed female hand is found in the Thames, which brings D.C.I. Conner in contact with Walker (who is now back in uniform). No body is discovered, and the case soon becomes a battle of wits against the killer.

When Susan Harrow does not come home, her mother reports her missing to the police. Her body is later discovered on waste land and a murder investigation is launched, once again headed by Det. Supt. Walker. There is later a second murder and they know that they have a serial killer on their hands.

Walker is assigned to investigate the discovery of a 17-year-old skeleton, which he isn't too happy about - especially as he's working with D.I. North's ex-boyfriend. They soon discover more skeletons buried at the house.

D.I. North investigates when a girl is snatched from a wood, but the confession of a local sex offender complicates matters. Detective Chief Superintendent Walker is little help, as he has worries of his own.

The murder of a Police Commander and his wife puts Walker, Connor and the team under pressure to get a quick result. Jewelery has been stolen from the house, which would indicate a burglary gone wrong, but several relatives profit from their deaths and so they focus the investigation on the family. Connor is suspicious of the identical twin sons in particular and suspects that they may have worked together in order to get away with patricide.

Another working girl, Maryna, is put on trial for assaulting Malikov. She claims self-defence but the trial is mishandled and walker is even more adamant then before that he will get the Ukrainian. Roisin, however, believes that his obsession with Malikov is blinding him to the identity of the real killer of Sonya and takes the investigation down a different route.

Ray Harper is devastated to find that Andy has hanged himself. Darren admits that he and Andy were a gay couple but dared not tell their families. The case against him collapses and he is released. Mike Walker is having troubles of his own with his teenage son but when Roisin decides to visit Darren at his flat she is in for a shock.

An ambulance is forced off the road as it is carrying a famous patient in the back. The patient is then shot in the head.

DS Satchell and his family find themselves the target of a notorious crime family when he witnesses the slaying of an informer following a jewellery raid.

DS Satchell is desperate to find his wife and daughter now that they are misssing. Walker and Connor try to find the evidence to put the Bilkin family behind bars. Satchell decides to take matters into his own hands when he feels he has nowhere else to turn.

A five-year-old girl goes missing and the police are called in to search. When her body is found inside a sewage pipe, it becomes a murder investigation, which is headed by Detective Superintendent Walker. They follow a few leads and eventually arrest a suspect, who is then sent to trial.