DCI Harry McNeil starts his new role in Edinburgh's cold case unit by reopening a twenty-year-old murder of a teenager, coinciding with the death of a woman under similar circumstances on a film set in a local cemetery. The investigation reveals a complex web of suspects as more killings occur, leaving McNeil to question if these are the acts of a serial killer with a two decade-long reign of terror.

DCI Harry McNeil tackles his first major investigation in the Scottish Highlands, where the disappearance of a wealthy family's daughter leads to the discovery of a burned body in a wedding gown. The case, stretching back fifteen years, challenges McNeil to solve the murder and prevent further tragedy.

The discovery of a female officer's remains, initially believed to be a straightforward murder, unveils her secret investigation into classified projects, leading DCI Harry McNeil down a path of high-tech espionage and government corruption as he races to solve the murder before the killer strikes again.

In the dead of winter, DCI Harry McNeil investigates a female corpse found inside a snowman, facing challenges from alleged misconduct. His pursuit of a serial killer connected to a cold case becomes a battle against nature and suspicion.

The murder of DCI Harry McNeil's stepfather propels him into an investigation in upscale Edinburgh, where a seemingly ordinary victim's life hides a sinister truth. As the case becomes personal, McNeil must find the killer before his family is targeted.

DCI Harry McNeil returns to action after two criminals escape during a transport van explosion. With Glasgow detectives joining the hunt, McNeil faces a race against time to prevent a spree of violent killings by the fugitives.

Visiting a dementia-afflicted former colleague, DCI Harry McNeil uncovers a link to a serial killer believed to be dead after discovering recent murders connected to a twenty-year-old case, leading him to question the retired policeman's involvement.

The discovery of a millionaire's body, missing for thirty-five years, coincides with a family gathering on their ancestral island and a subsequent murder. DCI Harry McNeil investigates the cold case and the current killing, uncovering hidden motives as the body count rises.

Amidst Christmas festivities in a Highland town, DCI Harry McNeil investigates a thirty-year-old case rekindled by the discovery of a decomposed body and a series of events drawing attention to unsolved murders, racing against time as the killer aims to strike again during the holiday season.

The recent murder of a teenager, missing for five years and found near Portobello Beach, mirrors current abductions, pushing DCI Harry McNeil and his team to solve a case intertwining past and present kidnappings, with a race against time to prevent further victims.

The legend of Nightmare, a mythical figure feared by children, becomes a terrifying reality when a young girl is found dead with “I am Nightmare” carved into her. With graffiti hinting at Nightmare's return, the murder of a reporter in the Highlands prompts DCI Harry McNeil and his team to investigate, linking the legend to a series of murders.

While on sabbatical, DCI Harry McNeil is drawn into the disappearance of a special needs man missing for two years. The case takes a turn when a body connected to the missing man is discovered in Loch Lomond, leading McNeil into danger as he uncovers a killer's return.

Returning to CID, DCI Harry McNeil and DI Frank Miller investigate a body found torn apart, reminiscent of an old case. With new management in Edinburgh's police division, McNeil and Miller navigate through a complex investigation, uncovering surprising truths.

During Edinburgh's New Year celebrations, DCI Harry McNeil investigates a woman's body found floating in the Water of Leith. A vicious killer challenges McNeil's new team, forcing him into a personal confrontation with the murderer.

The murder of a politician with a past connection to DCI Harry McNeil triggers an investigation into his death and history. McNeil and his team pursue a killer targeting the politician for unknown reasons, with the case impacting McNeil personally.

Following a serial killer's death in prison, DCI Harry McNeil discovers a message indicating more victims. With new murders mirroring the past, McNeil hunts for a protégé continuing the killer's legacy, while DI Max Hold investigates a related case in the Cairngorm National Park.

DCI Harry McNeil investigates the murder of an MSP in Edinburgh, which mimics past crime scenes. The killer, replicating historical murders, poses a direct challenge to McNeil as the investigation uncovers a deep knowledge of crime scenes.

After a young man's body is found in an abandoned caravan, DCI Harry McNeil delves into the victim's complex past and a previous crime. As the investigation extends to Glasgow, McNeil confronts a killer seeking revenge for past actions.

The murder of a celebrated author leads DCI Harry McNeil on a hunt for a remorseless murderer, while DCI Angie Fisher becomes entangled in her ex-husband's suspicion of foul play in his father-in-law's death, unraveling a series of targeted attacks.

The murder of a respected psychiatrist presents DCI Harry McNeil with a case filled with silent witnesses and hidden resentments. As he investigates, DI Frank Miller faces a deadly threat linked to a mysterious woman, pushing both detectives to their limits.