Tom Novak is a troubled soul with a dark and bloody past. A former refugee, Royal Marine and member of the elite Special Reconnaissance Regiment, he now finds himself struggling with the deadening routine of day-to-day policing. When he is deployed undercover to infiltrate a gang of people traffickers, things go badly wrong. Faced with an impossible choice, his cover is blown, and he finds himself on the run from the Serbian mafia and even his fellow police colleagues.

The annual West Uist literary festival - The Gathering - always attracts the best in the business. But with the tiny island population suddenly doubling, the local police force is stretched to breaking point. And this year they have to deal with more than just drunken fights and rowdy behavior. Ranald Buchanan, the local poet, is found dead, with his head brutally caved in, and Inspector Torquil McKinnon is brought in to investigate.

Tom Novak and Stella Mitchell are covering the aftermath of a chilling terror attack on the British Prime Minister and the US Secretary of Defense. But the further the American and English duo investigate, the more holes they find in the official version of events. When they link the attack to a series of suspicious deaths the night before, Novak and Mitchell find themselves the next targets in an extraordinary conspiracy involving the White House, the British government, and a shadowy deep-state organization.

Five years ago, DCI John Lomond led the search for notorious Glasgow child-killer ‘The Sandman', until personal tragedy forced him off the case. In Lomond's absence, the killer was never found. Now, with nothing but work left in his life, Lomond remains obsessed with the case–despite the nightmares it brings. When a child is abducted in similar Sandman fashion from an affluent Glasgow suburb, Lomond is brought in to find them before it's too late.

It is 1969 and Glasgow is in the grip of the worst winter in decades, yet it is something else that has Glaswegians on edge: a serial killer whose name alone is enough to make them tremble with fear. The Quaker has killed another victim, snatching a young woman from a nightclub and dumping her body like trash in the back of a cold-water tenement. He leaves no clues, and the investigation has led police down one blind alley after another.

Ian Softley is a killer. He's the man governments call when they want somebody dead. His is a life of intimidation and brutality, of beatings and executions—including, ultimately, his own. Jack Softley's life is a world away from his brother's. A high school English teacher, devoted father, and all-round nice guy, Jack tries to stay as far from trouble as possible. But when he receives word that Ian has been murdered, he finds himself dragged into a storm of violence and danger. Because the same people who killed his brother want him dead too.

After an elite criminal profiling unit is shut down amid a storm of scandal and mismanagement, only one person emerges unscathed. Forensic psychiatrist Doctor Alexander Gregory has a reputation for being able to step inside the darkest minds to uncover whatever secrets lie hidden there, and soon enough he finds himself drawn into the murky world of murder investigation. In the beautiful hills of County Mayo, Ireland, a killer is on the loose. Panic has a stranglehold on its rural community, and the Garda are running out of time.

As Acting DC Scott Cullen works with DC Craig Hunter to track down a witness who didn’t show during a court case, they stumble upon another crime–two homeless women, dying of a suspected heroin overdose. As they investigate, they uncover a far-reaching criminal empire, dealing death and misery to Edinburgh’s underclass. And come across another investigative team who may not be exactly on the same side. As the case brings two cops together and drives a wedge between another pair, can Cullen and Hunter rescue the witness and bring her assailant to justice?

A killer stalks the streets of Glasgow, his attacks bestial in their ferocity. The police are lost, and soon, as the past begins to haunt them, they themselves become targets. Step forward Detective Sergeant Hutton, adrift in a sea of love, lust, deception, alcohol and murdered colleagues. And lost though he is, the dead will not rest, the past will not be buried, and Hutton must find the answers before the killer strikes again.

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.