When psychological profiler Tony Hill comes across a series of suicides among women tormented by vicious online predators, he begins to wonder if there is more to these tragedies than meets the eye. Could it be murder? But what kind of serial killer wants his crimes to stay hidden? Tony and DCI Carol Jordan begin the hunt for the most dangerous and terrifying kind of killer - someone who has nothing to fear and nothing to lose.

It's the summer solstice weekend, and 150,000 people have descended on a farm in the northeast of England for an open-air music festival. Reporting on the event is journalist Zoe Meadows, who files her copy from a food van run by her friends Sam and Lisa. When some of Sam's customers get sick, it looks like food poisoning, and it's exacerbated by the mud, rain and inadequate sanitary facilities. It's assumed to be a 24-hour thing until people get home and discover strange skin lesions, which ulcerate and turn septic. More people start getting ill - and dying.

When Robbie Bishop, star midfielder for the Bradfield Vics, is poisoned by a rare and deadly toxin, profiler Dr Tony Hill and trusted colleague DCI Carol Jordan have their work cut out for them. Then a bomb explodes in the football stadium, causing massive casualties - and another man dies from poisoning. Is there a link between the cases? What are the motives for these crimes? The clock is ticking, and the death toll keeps rising....

A quiet night on a country road. The stillness shattered by a car engulfed in flames, and a burned body discovered in the driver's seat. As the investigation unfolds, DCI Carol Jordan and psychological profiler. Tony Hill quickly realise that this is more than just a tragic accident. And so begins the hunt for a truly terrifying killer, someone who believes he is invisible, untraceable and untouchable. 

A dead girl lies on a blood-soaked mattress, her limbs spread in a parody of ecstasy. The scene matches a series of murders which ended with the conviction of Derek Tyler. But Tyler's been locked up in a mental institution for two years, barely speaking a word. Criminal psychologist Dr Tony Hill thinks this is not a copycat murder but something much stranger. Hill heads towards a terrifying face-off with one of the most perverse killers he has ever encountered….

There is one serial killer who has shaped and defined police profiler Tony Hill's life. One serial killer whose evil surpasses all others. One serial killer who has the power to chill him to the bone: Jacko Vance. And now Jacko is back in Tony's life. Even more twisted and cunning than ever before, he is focused on wreaking revenge on Tony - and DCI Carol Jordan - for the years he has spent in prison. Tony doesn't know when Jacko will strike, or where. 

After an explosive case that forced Tony Hill and Carol Jordan to reassess everything they thought they knew about right and wrong, both are dealing with the fallout in their own separate ways. While Tony must pay the price for his actions, Carol is conducting investigations into suspected miscarriages of justice. But when a shocking discovery is made on a construction site, and skeletal remains are found to belong to a killer who is supposedly alive and in prison, suddenly Tony and Carol are brought into each other's orbit once again.... 

Meet Tony Hill's most twisted adversary - a killer with a shopping list of victims, driven by the most perverted of desires. The murder and mutilation of teenager Jennifer Maidment is horrific enough on its own. But it's not long before Tony realises it's just the start of a brutal and ruthless campaign that's targeting an apparently unconnected group of young people. Tony battles to find the answers that will give him personal and professional satisfaction in his most testing investigation yet.

Up until now the only serial killers Tony Hill had encountered were safely behind bars. This one’s different - this one’s on the loose. Four men have been found mutilated and tortured. As fear grips the city, the police turn to clinical psychologist Tony Hill for a profile of the killer. But soon Tony becomes the unsuspecting target in a battle of wits and wills, where he has to use every ounce of his professional nerve to survive.

A twisted killer targeting psychologists has left a grisly trail across Europe. Dr Tony Hill, expert at mapping the minds of murderers, is reluctant to get involved. But then the next victim is much closer to home....Meanwhile his former partner, DCI Carol Jordan, is working undercover in Berlin on a dangerous operation to trap a millionaire trafficker. When the game turns nasty, Tony is the only person she can call on for help.