Every Monday evening six people gather in a smart North London house to talk about shame. A respected doctor, a well-heeled housewife, a young male prostitute...they could not be more different. All they have in common is a history of addiction. But when one of the group is murdered, it quickly becomes apparent that someone else in that circle is responsible. The investigation is hampered by the strict confidentiality that binds these individuals and their therapist together, which makes things difficult for Detective Inspector Nicola Tanner.

Ryan Wilkins grew up on a trailer park, a member of what many people would call the criminal classes. As a young Detective Inspector, he's lost none of his disgust with privileged elites - or his objectionable manners. But he notices things; they stick to his eyes. His professional partner, DI Ray Wilkins, of affluent Nigerian London heritage, is an impeccably groomed, smooth-talking graduate of Balliol College, Oxford. You wouldn't think they would get on. They don't. But when a young woman is found strangled at Barnabas Hall, they're forced to.

Tucked away among Devon's rolling green hills, Mallowan Hall combines the best of English tradition with the modern conveniences of 1930. Housekeeper Phyllida Bright, as efficient as she is personable, manages the large household with an iron fist in her very elegant glove. In one respect, however, Mallowan Hall stands far apart from other picturesque country houses. The manor is home to archaeologist Max Mallowan and his famous wife, Agatha Christie.

“Old spies grow ridiculous, River. Old spies aren’t much better than clowns.” Or so David Cartwright, the late retired head of MI5, used to tell his grandson. He forgot to add that old spies can be dangerous, too, especially if they’ve fallen on hard times—as River Cartwright is about to learn the hard way.

Alice Armitage is a police officer. Or she was. Following a debilitating bout of PTSD, self-medication with drink and drugs, and a psychotic breakdown, Alice is now a long-term patient in an acute psychiatric ward. Though convinced that she doesn't really belong there, she finds companionship with the other patients in the ward despite their challenging and often intimidating issues. So when one of her fellow patients is murdered, Alice feels personally compelled to launch an investigation from within the ward.

On the backstreets of Lyon, France, an MI6 surveillance team are gunned down in a cold-blooded ambush. Thrust into the hunt for the assassin is the sole survivor – rookie covert operative Duncan Grant. His feats in training are already the stuff of legend. His tough, solitary existence on Scotland's Isle of Skye forging a man willing to kill to protect the innocent and save lives. But no training can prepare Grant for the devastating consequences his first kill will unleash.

Three British couples meet around the pool on their Florida holiday and become fast friends. But on Easter Sunday, the last day of their vacation, tragedy strikes: the 14-year-old daughter of an American vacationer goes missing, and her body is later found floating in the mangroves. When the shocked couples return home to the UK, they remain in contact, and over the course of three increasingly fraught dinner parties they come to know one another better. But they don't always like what they find.

DS George Cross can be rude, difficult and awkward with people. But his unfailing logic and dogged pursuit of the truth means his conviction rate is the best on the force. So when his police colleagues dismiss the death of a man as a squabble among Bristol's homeless community, Detective Sergeant George Cross is not convinced.

Murder is a dish best served ice cold... In the idyllic, small town of Dewstow, Margery and Clementine are eagerly awaiting retirement from their work on the front-line serving meals to the students at Summerview secondary school. Their peaceful life is shattered when their kitchen manager is found dead in the school’s walk-in freezer. The police are adamant that it’s an open-and-shut case of accidental death. But Margery and Clementine are convinced that something more sinister is afoot and take it upon themselves to investigate.

Dee has come to London to investigate the murder of a man he’d known during World War I when serving with the Chinese Labour Corps. No sooner has Dee interviewed the grieving widow than another dead body turns up. Then another. All stabbed to death with a butterfly sword. Will Dee and Lao be able to connect the threads of the murders—or are they next in line as victims?

July 2015, Sevenoaks. 12-year-old schoolgirl Alice Johnson went missing while doing her paper round, her bag found discarded on the pavement. At 08.00, she was spotted standing in heavy rain at the side of the busy by-pass. At 11.00, she was seen talking to the driver of a black car in Tonbridge. After that, nothing. Alice was never found. Nine years later the body of another schoolgirl, Joleen Price, is pulled from a nearby lake and a local man named Vince Burns detained. Convinced that Burns is guilty in both cases, SIO Dave Armstrong calls in the Finder.

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.

DI Jan Talantire is called to a cottage in Ilfracombe, where the female occupant is found dead, impaled with a crucifix. The woman, who had been renting the house for a few months, is well known locally, but the documents at the house indicate her real name is Ruth Lyle. The name means nothing to the young PC who found her, DI Talantire knows this cannot be the body of Ruth Lyle.

On Christmas Eve, DCI Mackenzie Jones is called to a shooting at a remote farmhouse. Ralph Mallender believes his father lies dead inside. When three more bodies are discovered, it's clear a festive family gathering has turned into a gruesome tragedy. At first it seems like an open and shut case: a murder suicide committed by Ralph's volatile brother Cameron. Then new evidence makes Mack suspect the man who reported the crime is in fact the perpetrator. But Mack isn't the only one with a stake in the case.

Lachlan Kite is a member of BOX 88, an elite transatlantic black-ops outfit so covert that not even MI6 and the CIA are certain of its existence - but even the best spy can't anticipate every potential threat in a world where dangerous actors lurk around every corner. At the funeral of his childhood best friend, Lachlan falls into a trap that drops him into the hands of a potentially deadly interrogation, with his pregnant wife, also abducted, being held as collateral for the information he's sworn on his own life to protect.