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. 

A brutal killing takes place on the Isle of Lewis, Scotland: a land of harsh beauty and inhabitants of deep-rooted faith. Detective Inspector Fin Macleod is sent from Edinburgh to investigate. For Lewis-born Macleod, the case represents a journey both home and into his past. Something lurks within the close-knit island community. Something sinister.

Spain, 2020. When expat fugitive Jack Cleland watches his girlfriend die, gunned down in a pursuit involving officer Cristina Sanchez Pradell, he promises to exact his revenge by destroying the policewoman. Cristina's aunt Ana has been deaf-blind for the entirety of her adult life: the victim of a rare condition named Usher Syndrome. Ana is the centre of Cristina's world - and of Cleland's cruel plan. John Mackenzie - an ingenious yet irascible Glaswegian investigator - is seconded to aid the Spanish authorities in their manhunt.

A man stands bewildered on a deserted beach on the Hebridean Isle of Harris. He cannot remember who he is. The only clue to his identity is a folded map of a path named the Coffin Road. He does not know where this search will take him. A detective from Lewis sits aboard a boat, filled with doubt. DS George Gunn knows that a bludgeoned corpse has been discovered on a remote rock 20 miles offshore. He does not know if he has what it takes to uncover how and why.

When Detective Sime Mackenzie boards a light aircraft at Montreal's St. Hubert airfield, he does so without looking back. For Sime, the 850-mile journey ahead represents an opportunity to escape the bitter blend of loneliness and regret that has come to characterise his life in the city. Travelling as part of an eight-officer investigation team, Sime's destination lies in the Gulf of St. Lawrence. Only two kilometres wide and three long, Entry Island is home to a population of around 130 inhabitants - the wealthiest of which has just been discovered murdered in his home.

Cambodia, 1978. Amid the Khmer Rouge's crazed genocide, soldier of fortune Jack Elliott is given the impossible task of rescuing a family from the regime. Eighteen-year-old orphan and budding journalist Lisa Robinson has received the impossible news that her father is, in fact, alive. His name - Jack Elliott. As Jack tracks the hostages and Lisa traces her heritage, each is intent on reuniting a family. Yet to succeed, so must run a dangerous gauntlet of bullets and betrayal.

Thirty years ago, a child was found in the New Jersey backwoods. He had been living a feral existence, with no memory of how he got there or even who he is. Everyone just calls him Wilde. Now a former soldier and security expert, he lives off the grid, shunned by the community - until they need him. A child has gone missing. With her family suspecting she’s just playing a disappearing game, nobody seems concerned except for criminal attorney Hester Crimstein. She contacts Wilde, asking him to use his unique skills to find the girl.

Paris. An old mystery. As midnight strikes, a man desperately seeking sanctuary flees into a church. The next day, his sudden disappearance will make him famous throughout France. A new science. Forensic expert Enzo Macleod takes a wager to solve the seven most notorious French murders, armed with modern technology and a total disregard for the justice system. A fresh trail. Deep in the catacombs below the city, he unearths dark clues deliberately set - and as he draws closer to the killer, discovers that he is to be the next victim.

Alicia Berenson’s life is seemingly perfect. A famous painter married to an in-demand fashion photographer, she lives in a grand house with big windows overlooking a park in one of London’s most desirable areas. One evening, her husband Gabriel returns home late from a fashion shoot, and Alicia shoots him five times in the face and then never speaks another word. Alicia’s refusal to talk, or give any kind of explanation, turns a domestic tragedy into something far grander, a mystery that captures the public imagination and casts Alicia into notoriety.

Husband and wife Niamh and Ruairidh Macfarlane co-own Ranish Tweed: a Hebridean company that weaves its own special variety of Harris cloth, which has become a sought-after brand in the world of high fashion. But when Niamh learns of Ruairidh's affair with Russian designer Irina Vetrov, then witnesses the pair killed by a car bomb in Paris, her life is left in ruins. Along with her husband's remains, she returns home to the Isle of Lewis bereft.