Inside a Los Angeles church, on the altar steps, lies the blood-soaked, decapitated body of a priest. Carefully positioned, legs stretched out, arms crossed over the chest, the most horrifying thing of all is that the priest's head has been replaced by that of a dog. Later, the forensic team discover that on the victim's chest, the figure 3 has been scrawled in blood.

When an unidentified female body is discovered laid out on a slab in an abandoned butcher's shop, the cause of death is unclear. Her body bares no marks - except for the fact that her lips have been carefully stitched shut. It is only when the full autopsy gets underway at the Los Angeles County morgue that the pathologist will reveal the true horror of the situation.

A student nurse has the shock of her life when she discovers her patient, prosecutor Derek Nicholson, brutally murdered in his bed. The act seems senseless - Nicholson was terminally ill, with only weeks to live. But what most shocks Detective Robert Hunter of the Los Angeles Robbery Homicide Division is the calling card the killer left behind.

Detective Robert Hunter of the LAPD's Homicide Special Section receives an anonymous call asking him to go to a specific web address - a private broadcast. Hunter logs on, and a show devised for his eyes only immediately begins. But the caller doesn't want Detective Hunter to just watch; he wants him to participate, and refusal is simply not an option. Forced to make a sickening choice, Hunter must sit and watch as an unidentified victim is tortured and murdered live over the Internet.

A freak accident in rural Wyoming leads the sheriff's department to arrest a man for a possible double homicide, but further investigations suggest a much more horrifying discovery - a serial killer who has been kidnapping, torturing, and mutilating victims all over the United States for at least 25 years. The suspect claims he is a pawn in a huge labyrinth of lies and deception - can he be believed?

They met for the first time in college. Two of the brightest minds ever to graduate from the prestigious Stanford University. They met again in Quantico, Virginia. Robert Hunter has become the head of the LAPD’s Ultra Violent Crimes Unit. Lucien Folter has become the most prolific and dangerous serial killer in FBI history. The FBI caught Lucien. He's been in prison for years. But Lucien has just escaped. And he’s angry. He's going to make the person who put him away suffer. That person...is Robert Hunter.

After a tough week, Tanya Kaitlin is looking forward to a relaxing night in, but as she steps out of her shower, she hears her phone ring. The video call request comes from her best friend, Karen Ward. Tanya takes the call, and the nightmare begins. Karen is gagged and bound to a chair in her own living room. If Tanya disconnects from the call, if she looks away from the camera, he will come after her next, the deep, raspy, demonic voice at the other end of the line promises her.

'Thirty-seven years in the force, and if I was allowed to choose just one thing to erase from my mind, what's inside that room would be it.' That's what a LAPD Lieutenant tells Detectives Hunter and Garcia of the Ultra Violent Crimes Unit as they arrive at one of the most shocking crime scenes they have ever attended. In a completely unexpected turn of events, the detectives find themselves joining forces with the FBI to track down a serial killer whose hunting ground sees no borders, a psychopath who loves what he does.

Once a luxurious getaway for a wealthy Southern family, the Summer House in rural Sullivan, Georgia, has long since fallen into disrepair and become a decaying rental property. But now it is also the scene of an horrific mass murder. Shocking evidence points to four Army Rangers recently returned from Afghanistan. To ensure that justice is done, the Army sends Major Jeremiah Cook, a war veteran and former NYPD cop, to investigate.

DI Nathaniel Caslin has earned the freedom to run his case load as he sees fit, bypassing the hierarchical constraints with his specialist unit. Little does he know a deadly adversary is walking the streets of York. One who will push the team to their psychological limits. Reluctantly agreeing to a joint investigation alongside a detective from the Drug Squad, Caslin is perplexed by the multiple homicides of a number of addicts. Poisoned by their own supply with no apparent motive, the killings appear gang related.

Tormented and racked with guilt over the brutal slaying of his wife and daughter, Charlie Parker, ex-cop with the NYPD, agrees to track down a missing girl. It is a search that will lead him into an abyss of evil. At the same time, he is warned by an old black woman in Louisiana that "The Travelling Man" is about to strike again. Multiple strands converge with a horrific confrontation in which hunter and hunted are intimately connected by guilt.

It's DS Logan McRae's first day back on the job after a year off on the sick, and it couldn't get much worse. Three-year-old David Reid's body is discovered in a ditch: strangled, mutilated and a long time dead. And he's only the first. There's a serial killer stalking the Granite City, and the local media are baying for blood. Soon the dead are piling up in the morgue almost as fast as the snow on the streets, and Logan knows time is running out. More children are going missing. More are going to die.

A killer is changing the rules. One murder at a time. You wake up all alone, in the middle of a forest, miles from anywhere. Beside you lie five objects - a lighter, grease, picture-frame wire, a piece of silk, a bottle of water - which you will need to use if you want to survive. You’ve been taken by the Whispering Man, and there is no escape. He makes the rules, and nobody ever gets out alive. Enigmatic investigator Colter Shaw is fighting to stop the murders. But another victim has been snatched from her family, and he’s running out of time.

Still devastated after the loss of his wife, Tom Kennedy and his young son, Jake, move to the sleepy village of Featherbank, looking for a fresh start. But Featherbank has a dark past. Fifteen years ago a twisted serial killer abducted and murdered five young boys. Until he was finally caught, the killer was known as 'The Whisper Man'. Of course, an old crime need not trouble Tom and Jake as they try to settle in to their new home. Except that now another young boy has gone missing, stirring up rumours that the original killer was always known to have an accomplice.

FBI researcher Emma Dockery is back with a vengeance. Obsessed with finding a link between a string of deaths across several different states, she is convinced that there's a pattern. And where there's a pattern, there's a serial killer to put a stop to. When Detectives working on some of these cases start turning up dead, Emma knows that she's onto something.