DS Ewan Striker is the best detective on the force. Unconventional and uncompromising, he is respected and feared in equal amounts. Tag Westland is a rookie. A rich boy who has realised that being a cop is not as glamorous as he first thought. In fact, he has his resignation in his pocket. These two unlikely crime fighters are thrown together, as it becomes apparent that each of their investigations are inextricably linked to something even more evil: a major terrorist attack.

When a body is found in a locked house, Detective Sergeant Jessica Daniel is left to not only find the killer but discover how they got in and out. With little in the way of leads and a journalist who seems to know more about the case than she does, Jessica is already feeling the pressure - and that's before a second body shows up in identical circumstances to the first. How can a murderer get to victims in seemingly impossible situations and what, if anything, links the bodies?

Rookie Cop Dave Stewart knew that William Bailey was guilty of murder. All he had to do to convict him was change one line in his statement. Detective Chief Superintendent John McCauley loves dirt. He collects it in secret files to use against his enemies, and since Stewart slept with the beautiful Detective Sergeant Anne Wallace, he is the enemy. Stewart hatches a plan to destroy the evidence against him, but inside McCauley's files is evidence of a vile paedophile ring operating under the Chief's nose. Now three people are dead, and Dave Stewart is the prime suspect.

It was 2:47 a.m. when Chief Inspector Alan Banks arrived at the barn and saw the body of Keith Rothwell for the first time. Only hours earlier two masked men had walked the mild-mannered accountant out of his farmhouse and clinically blasted him with a shotgun. Clearly this is a professional hit - but Keith was hardly the sort of person to make deadly enemies. Or was he? For the police investigation soon raises more questions than answers. And who, exactly, is Robert Clavert?

In the winter of 1996, on the orders of the British government, the SAS stole the contents of a safe belonging to the Provisional IRA. Rick Fuller headed that team. Days later Fuller's wife was brutally murdered. Convinced he was betrayed from within, Fuller begins a relentless search for her murderers. Ten years on, Fuller is a Manchester gangland enforcer, a lone and bitter figure.

In Manchester, two hardened gang members on the run take Catherine Blake and her one-year-old son hostage at gunpoint. She is in the wrong place at the wrong time. Held in a Transit van, Catherine needs a plan fast. But it means diving into her captors’ risk-drenched world, and playing them at their own game. Catherine has been through cancer, miscarriages and five draining years of IVF in order to have her son Ethan. He is the most precious thing in the world. She may be terrified out of her wits, but she’d do anything to protect him. Anything, no matter the cost. Brace yourself.

Dennis Milne is a man with a past, and a past that involves murder. A former cop, he’s earned his living killing the bad guys – drug-dealers, corrupt business men - people who, in his opinion, deserve to die. For the past two days, he’s been in Manila, waiting for his next target: a young woman who’s made herself some poor life-choices, and some even worse enemies. DI Tina Boyd is a woman on a mission. Tough, spiky and determined, she’s looking for the man she holds responsible for the death of her lover.

In the present, an old fisherman is found dead by the shoreline and a stranger with a mission moves into a shabby Kinloch flat/ Meanwhile, D.C.I. Jim Daley is trying to help Brian Scott stay sober, and the good people of Kinloch are still mourning the death of one of their own. As past and present collide, Daley finds himself face to face with old friends and foes. Memories can only last as long as those who keep them, and ghosts will not be silenced.

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. 

Ex-cop Bierce has been in prison for over 20 years, following his conviction for the murders of his wife and son. He has no memory of the tragedy and has never been able to say with certainty that he didn't do it - except he cannot imagine why on earth he would have killed his beloved family.

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.

Dublin. Joshua Boyce watches a jewellers as he plans a job; Dixie Payton desperate for cash attempts a mugging; DI Synott calls on a rape suspect, convinced of his guilt; gangland boss Lar MacKendrick is getting back into shape after brothers Jo-Jo's murder. Criminals and police each have their own code, with both sides resorting to desperate measures as a means to an end.

1969. Eloise Shepherd, one of MI6’s brightest rising stars, is working undercover in Soviet Russia as Magdalina Novikova. Her mission is to persuade nuclear physicist Stanislav Kalashnik to defect and bring his knowledge of Russian weapons back to the UK. On the verge of success, the operation fails suddenly and spectacularly. Seventeen years later, Kalashnik is chief engineer at the power plant near Pripyat known as Chernobyl. His concerns for the safety of the plant are growing. 

When you're the best at what you do, it's not always easy to walk away. Nathan McBride was retired. The trained Marine sniper and covert CIA operative had put the violence of his former life behind him. But not anymore. A deep-cover FBI agent has disappeared along with one ton of powerful Semtex explosive, enough to unleash a disaster of international proportions. The U.S. government has no choice but to coax Nathan out of retirement.

A bomb explodes in a newly designed shopping complex, ripping through the lives of everyone in its wake. Confirmed as a targeted terrorist attack, special units are quickly brought in to lock down the area. For bomb-disposal expert, Staff Sergeant Dominic Riley, Afghanistan never feels far away and that’s especially true on the morning of the bombing. And it's only just beginning.