Half-Scottish, half-Italian Enzo MacLeod used to be one of the top forensics experts in Scotland, and now he lives in Toulouse, working as a university professor. Divorced in Scotland and widowed in France, he has an estranged Scottish daughter and a French daughter he has raised by himself. As if his life isn't complicated enough, he soon finds himself unexpectedly on the hunt for solutions to some vexing cold cases thanks to an ill-advised wager about the power of forensic science.

Nobody likes The Complaints—they're the cops who investigate other cops. It's a department known within the force as The Dark Side, and it's where Malcolm Fox works. He's a serious man with a father in a nursing home and a sister who persists in an abusive relationship, frustrating problems about which he cannot seem to do anything.

The Complaints: that's the name given to the Internal Affairs department who seek out dirty and compromised cops, the ones who've made deals with the devil. And sometimes The Complaints must travel. A major inquiry into a neighboring police force sees Malcolm Fox and his colleagues cast adrift, unsure of territory, protocol, or who they can trust. An entire station-house looks to have been compromised, but as Fox digs deeper, he finds the trail leads him back in time to the suicide of a prominent politician and activist.

Albert Campion, an eccentric but intelligent and resourceful man, becomes involved in a mysterious crime in Black Dudley, an isolated country estate owned by the wealthy and secretive Dudley family. A grand gathering is taking place at the house, but not all will leave.

Dr. Morton Handler practiced a strange brand of psychiatry. Among his specialties were fraud, extortion, and sexual manipulation. Handler paid for his sins when he was brutally murdered in his luxurious Pacific Palisades apartment. The police have no leads, but they do have one possible witness: seven-year-old Melody Quinn.

The story opens with the apparently accidental drowning of a sixth form student in the Norfolk countryside. As a matter of routine, or so it seems, the case passes across the desk of Detective Sergeant Smith, recently returned to work after an internal investigation into another case that has led to tensions between officers at Kings Lake police headquarters. As an ex-DCI, Smith could have retired by now, and it is clear that some of his superiors wish that he would do so.

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?

Ian Rutledge returns to his career at Scotland Yard after years fighting in the First World War. Unknown to his colleagues he is still suffering from shell shock, and is burdened with the guilt of having had executed a young soldier on the battlefield for refusing to fight. A jealous colleague has learned of his secret and has managed to have Rutledge assigned to a difficult case which could spell disaster for Rutledge whatever the outcome. A retired officer has been murdered, and Rutledge goes to investigate.

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.

As England prepares to fight the Nazis, three very different women answer the call to mysterious country estate Bletchley Park, where the best minds in Britain train to break German military codes. Vivacious debutante Osla is the girl who has everything - beauty, wealth, and the dashing Prince Philip of Greece sending her roses - but she burns to prove herself as more than a society girl, and puts her fluent German to use as a translator of decoded enemy secrets.

Evan Evans is a young police constable who has traded in the violence of city life for idyllic Llanfair, a Welsh village tucked far away from trouble. Nestled among the Snowdonia mountain range, Llanfair looks to Constable Evans like a town forgotten by time, but he quickly learns that even the bucolic countryside has its share of eccentric - and deadly - characters.

It is 997 CE, the end of the Dark Ages. England is facing attacks from the Welsh in the west and the Vikings in the east. Those in power bend justice according to their will, regardless of ordinary people and often in conflict with the king. Without a clear rule of law, chaos reigns. In these turbulent times, three characters find their lives intertwined.

Detective Chief Inspector Harry Grimm is forced to take leave from Bristol’s Major Investigations Team when his boss, tired of Harry chasing the ghost of his murderous father, sends him north on secondment. Used to city life and high stress, Harry fears his life will now be spent handing out speeding tickets, finding lost sheep, and directing tourists. But when a local teenager runs away, Harry finds himself pulled into an investigation much worse than anyone could have ever expected.

It's 1949. When war veteran Aloysius Archer is released from Carderock Prison, he is sent to Poca City on parole with a short list of dos and a much longer list of don'ts: do report regularly to his parole officer, don't go to bars, certainly don't drink alcohol, do get a job - and don't ever associate with loose women. The small town quickly proves more complicated and dangerous than Archer's years serving in the war or his time in jail.

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.