A family day out turns sour for DI McKay when he stumbles across an unidentified corpse. The day becomes darker still when his brother-in-law goes missing and is eventually found dead, the result of a seemingly accidental fall. Meanwhile, DCI Helena Grant has a disastrous on-line date with a pompous senior manager of a local hotel chain. Her initial amusement turns to unease at his disturbing behaviour. And, as she arrives home, she receives a threatening text from someone who has been watching her. 

DI Alec McKay is back. Twenty years ago, Jackie Galloway was a senior cop with a bad reputation. Then he ended up on the wrong side of the wrong people, and his career was ruined. Sacked and with no pension, he ends up eking out his last days on Scotland's Black Isle, his mind lost to dementia, supported only by his wife, Bridie...until Galloway is found dead. The police assume the death to be accidental until Bridie reveals that her husband has been receiving threatening letters containing only the phrase 'not forgotten. Not forgiven.'

DCI Kenny Murrain sees, hears and feels things that others do not. It’s a gift but also a curse. When he wakes to the phantom sound of screaming, he knows a murder has been committed, but not where or why. Then a woman’s body is found in a Stockport hotel room. It’s a murder that seems both frenzied and carefully planned, the scene expertly cleansed of any evidence. 

One winter's night, a lone figure arrives on foot in a remote Pennine village. The next morning, as the first heavy snow begins to fall, a man's body is discovered in the village churchyard. Anne Tilston, one of three sisters living in a brooding run-down house in the shadow of the church, realises that the dead man is her father, a disgraced former senior police officer long estranged from his family. 

A missing child's body is found on the edge of the Peak District. As DCI Kenny Murrain and his team investigate, more attempted child abductions are reported. Murrain's instincts tell him this is a community with secrets, and those secrets have their roots deep in the past. Unexpected connections surface as he uncovers mysteries long buried. A motorcycle accident in the nearby hills. The unexplained death of a local prison governor. And a high-profile child killing two decades before. 

Revellers are flocking into Greenborough for the yearly Dark Greenborough Festival, a three-day event celebrating local folklore, superstition, and the darker side of life. What the public doesn't know is that there has been a warning sent to the police, saying that Greenborough will be a very dangerous place this year. The anonymous letter ends with the Latin phrase, Mors certa, hora incerta: Death is certain, the hour uncertain.  

DI Alec McKay is a man haunted by the loss of his daughter. As he obsesses over a missing person case that is going nowhere, McKay's investigation is interrupted when bodies start appearing on the Scottish Black Isle. Soon McKay and his team start to identify a disturbing pattern behind the killings.

DI Ivan Winterman is a man with a troubled past. The Blitz has left his young son dead and his wife seriously injured. He has made enemies in high places, and, with his career going nowhere, he returns to his home town in East Anglia, seeking to rebuild his life. As the snow begins to fall, a drunken ex-clergyman stumbles on the semi-mummified body of a small child concealed in a ruined cottage. Days later, a second child's body is found in a Fenland dyke. Winterman, supported by a small team of assorted misfits, finds himself uncovering a web of secrets in the small rural community.

When 17-year-old Savannah Devenish vanishes from her family’s remote vacation cabin in Minnesota, FBI Agent Tori Hunter races along treacherous icy roads to be first on the scene. Savannah’s parents are frantic with worry for their beautiful, carefree girl. Haunted by memories of her own missing sister, Tori vows to do whatever it takes to reunite this family. When the police uncover that Savannah’s father, Jacob, was having an affair, they suspect his involvement, but Tori is convinced his despair is genuine.

It's nearly Christmas in Oxford, and Detective Inspector Bridget Hart is enjoying a rare day off at Oxford's Christmas Market. A ghost tour seems like a fun way to round off the day. Until, that is, a brutal murder brings the evening to a tragic close. Torn between work and family commitments over the festive season, Bridget soon discovers that the ghost of Christmas past is reaching out to the present with fatal consequences.

When the mutilated remains of a woman are retrieved by local fishermen, it falls to DI Tom Janssen and his team to identify how she came to be in the water and what put her there. Joined on the case by his new permanent boss, DCI Tamara Greave, it remains to be proven if the woman's death was a result of foul play or a tragic accident.

When Dr. Nathan Frost, a lecturer in German literature at Oxford University, is invited to a lavish party at the country house of a wealthy businessman, he knows there'll be a price to pay. After all, as an expert on the legend of Faust and Mephistopheles, he can recognize a deal with the devil easily enough. But even he's not expecting such a sinister end to the evening. 

DI Jack Knox is called in to investigate a high-profile case. A local distiller’s daughter has gone missing, and when he receives a ransom note, his fears that it is a kidnapping are confirmed. Knox decides to take a serious risk to capture the abductors, but the stakes could not be higher. The father is wealthy and well-connected. If Knox’s gamble goes wrong, he’ll have hell to pay. Meanwhile in the prequel story, 'Labyrinth', the body of an attractive young woman is found in woodland on Edinburgh’s iconic Calton Hill.

A body is found on a quiet lane in Exmoor, victim of a hit and run. He has no ID, no wallet, no phone, and - after being dragged along the road - no recognisable face. Meanwhile, fresh from his last case, DCI Craig Gillard is unexpectedly called away to Devon on family business. Gillard is soon embroiled when the car in question is traced to his aunt. As he delves deeper, a dark mystery reveals itself, haunted by family secrets, with repercussions Gillard could never have imagined. The past has never been deadlier.

DI Annie Delamere and her colleague DS Zoe Everett are off duty and enjoying a walk on the Peak District’s vast moorlands when they stumble across a mutilated corpse. While Annie is put in charge of the case, her long-term partner, MP Sheena Pearson, is confronted by a group of far-right extremists. Sheena chooses to stand her ground - and almost pays for it with her life. As more bodies are found, Annie is under pressure to prove her worth.