Ed Loy hasn't been back to Dublin for 20 years. Now his mother is dead and he has returned home to bury her. He soon realises that the world waiting for him is very different from the one he left behind all those years ago. An old classmate, Linda Dawson, pleads with him to find her missing husband, Peter. She doesn't want the police involved.

Was the biggest case of his career the worst mistake he ever made? Ten years ago, DCI Jack Logan stopped the serial child-killer dubbed "Mister Whisper", earning himself a commendation, a drinking problem, and a broken marriage in the process...When another child disappears a hundred miles north in the Highlands, Jack is sent to lead the investigation and bring the boy home. But as similarities between the two cases grow, could it be that Jack caught the wrong man all those years ago?

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.

Northern Ireland, spring 1981. Hunger strikes, riots, power cuts, a homophobic serial killer with a penchant for opera, and a young woman’s suicide that may yet turn out to be murder: on the surface, the events are unconnected, but then things—and people—aren’t always what they seem. Detective Sergeant Duffy is the man tasked with trying to get to the bottom of it all. It’s no easy job—especially when it turns out that one of the victims was involved in the IRA but was last seen discussing business with someone from the loyalist Ulster Volunteer Force.

When a 15-year-old girl fails to make it home after school, DI Heather Filson believes she’s dealing with just another teenage runaway. The girl’s grandfather, a notorious Glasgow gangster, disagrees. Convinced one of his underworld enemies has grabbed her, he’s prepared to bathe the city in blood in order to bring his princess home.

When a woman's body is discovered in a cathedral and hours later a young man is found hanging from a tree outside his home, Detective Lottie Parker is called in to lead the investigation. Both bodies have the same distinctive tattoo clumsily inscribed on their legs. It's clear the pair are connected, but how? The trail leads Lottie to St Angela's, a former children's home, with a dark connection to her own family history. Suddenly the case just got personal.

Former soldier. Ex-copper. Current man on the edge. Shunned by his old colleagues, and dividing his time between a dead-end job and the bottom of a whisky bottle, former Police Scotland detective superintendent Bob Hoon’s life is a mess. Then an old face from Hoon’s Special Forces days turns up asking for help: His teenage daughter has been missing for months, the police have drawn a blank, and he needs the kind of help that only Hoon can provide. And besides, Hoon owes him one.

Met cop DI Rob Marshall is hot on the trail of the serial killer known as the Chameleon, who has abducted, tortured and killed a series of young women in Northwest London. As they close in, the Chameleon—who switches identity to get close to his victims—shoots Marshall’s partner and escapes.

During the languid days of the Christmas break, a group of 30-something friends from Oxford meets to welcome in the New Year together, a tradition they began as students 10 years ago. For this vacation, they’ve chosen an idyllic and isolated estate in the Scottish Highlands - the perfect place to get away and unwind by themselves. They arrive on December 30, just before a historic blizzard seals the lodge off from the outside world. Two days later, on New Year’s Day, one of them is dead.

As dusk approaches a small Dublin suburb in the summer of 1984, mothers begin to call their children home. But on this warm evening, three children do not return from the dark and silent woods. When the police arrive, they find only one of the children gripping a tree trunk in terror, wearing blood-filled sneakers, and unable to recall a single detail of the previous hours. Twenty years later, the found boy, Rob Ryan, is a detective on the Dublin Murder Squad and keeps his past a secret.

Two criminal empires together control all of New England. Until a beautiful woman comes between the Irish and the Italians, launching a war that will see them kill each other, destroy an alliance, and set a city on fire. Danny Ryan yearns for a more “legit” life and a place in the sun. But as the bloody conflict stacks body on body and brother turns against brother, Danny has to rise above himself.

In 1975, a baby just minutes old is taken from its devastated mother. In 2010, the gruesome corpse of a nun is found in a Dublin public park. Detective Inspector Tom Reynolds and his team are on the scene and he’s convinced the murder is linked to historical events that took place in the infamous former Magdalene Laundries, institutions for “fallen women.” As Reynolds and his team follow the trail to an isolated convent, everything seems perfectly normal and it seems perhaps they’ve followed the wrong lead. But it soon becomes disturbingly clear that the killer is amongst them.

When they were children, Sean Devine, Jimmy Marcus, and Dave Boyle were friends. But then a strange car drove up their street. One boy got in the car, two did not, and something terrible happened - something that ended their friendship and changed the boys forever. Twenty-five years later, Sean is a homicide detective. Jimmy is an ex-con. And Dave is trying to hold his marriage together and keep his demons at bay - demons that urge him to do horrific things. When Jimmy's daughter is murdered, Sean is assigned to the case.

After a woman is brutally slain, investigators bring psychiatrist Joe O'Loughlin in for expert consultation. Joe is shocked to discover the dead woman is a former patient of his who cried rape when he rebuffed her sexual advances. Citing doctor/patient confidentiality, Joe hides this information. But the truth emerges, and suddenly he is the prime suspect.

The bodies of four men have been discovered in the town of Bradfield. Enlisted to investigate is criminal psychologist Tony Hill. But profiling the psychopath is not beyond him. Hill's own past has made him the perfect man to comprehend the killer's motives. It's also made him the perfect victim. A game has begun for the hunter and the hunted. But as Hill confronts his own hidden demons, he must also come face-to-face with an evil so profound he may not have the courage—or the power—to stop it.