In Broken Harbour, a ghost estate outside Dublin - half-built, half-inhabited, half-abandoned - two children and their father are dead. The mother is on her way to intensive care. Scorcher Kennedy is given the case because he is the Murder squad's star detective. At first he and his rookie partner, Richie, think this is a simple one: Pat Spain was a casualty of the recession, so he killed his children, tried to kill his wife Jenny, and finished off with himself.

The course of Frank Mackey's life was set by one defining moment when he was 19. The moment his girlfriend, Rosie Daly, failed to turn up for their rendezvous in Faithful Place, failed to run away with him to London as they had planned. Frank never heard from her again. Twenty years on, Frank is still in Dublin, working as an undercover cop. He's cut all ties with his dysfunctional family. Until his sister calls to say that Rosie's suitcase has been found....

Antoinette Conway, the tough, abrasive detective from The Secret Place, is still on the Murder Squad, but only just. She's partnered up with Stephen Moran now, and that's going well - but the rest of her working life isn't. Antoinette doesn't play well with others, and there's a vicious running campaign in the squad to get rid of her.

Still traumatised by her brush with a psychopath, Detective Cassie Maddox transfers out of the murder squad and starts a relationship with fellow detective Sam O'Neill. When he calls her to the scene of his new case, she is shocked to find that the murdered girl is her double. What's more, her ID shows she is Lexie Madison - the identity Cassie used years ago as an undercover detective.

When he was 12 years old, Adam Ryan went playing in the woods one day with his two best friends. He never saw them again. Their bodies were never found, and Adam himself was discovered with his back pressed against an oak tree and his shoes filled with blood. He had no memory of what had happened. Twenty years on, Rob Ryan - the child who came back - is a detective in the Dublin police force. He's changed his name. No one knows about his past.

Cal Hooper thought a fixer-upper in a bucolic Irish village would be the perfect escape. After 25 years in the Chicago police force and a bruising divorce, he just wants to build a new life in a pretty spot with a good pub where nothing much happens. But when a local kid whose brother has gone missing arm-twists him into investigating, Cal uncovers layers of darkness beneath his picturesque retreat, and starts to realize that even small towns shelter dangerous secrets.

When everyone is sleeping, he comes into their houses. He takes one thing. A photo of their child. A sinister thief on a power trip or something even darker and more sinister? Detectives Jackman and Evans find themselves on the hunt for a highly unusual burglar who seemingly only steals photographs. But then, late one night, an elderly woman falls to her death after seeing someone in her home. Did she really fall, or was she murdered? 

On a freezing winter morning, fishermen pull a body from the sea. It is quickly discovered that the dead man was the prime suspect in a decade-old investigation, when a prominent civil servant disappeared without trace. DCI Karen Pirie was the last detective to review the file and is drawn into a sinister world of betrayal and dark secrets. But Karen is already grappling with another case, one with even more questions and fewer answers. A skeleton has been discovered in an abandoned camper van and all clues point to a killer who never faced justice - a killer who is still out there.

When she's not digging up bones or other ancient objects, Ruth Galloway lectures at the University of North Norfolk. She lives happily alone in a remote place called Saltmarsh overlooking the North Sea and, for company; she has her cats Flint and Sparky, and Radio 4. When a child's bones are found in the marshes near an ancient site that Ruth worked on ten years earlier, Ruth is asked to date them.

When frantic, dishevelled Edie Ledwell appears in the office begging to speak to her, private detective Robin Ellacott doesn't know quite what to make of the situation. The co-creator of a popular cartoon, The Ink Black Heart, Edie is being persecuted by a mysterious online figure who goes by the pseudonym of Anomie. Edie is desperate to uncover Anomie's true identity. Robin decides that the agency can't help with this—and thinks nothing more of it until a few days later, when she reads the shocking news that Edie has been tasered and then murdered in Highgate Cemetery.

One moonlit night, the bodies of two young people are discovered lying entwined on a blanket in the woods. The young man is clutching a red rose. It appears to be a lovers' suicide pact.... Until Detective Nikki Galena and DS Joseph Easter look more closely. Romeo and Juliet, as they decide to call them, were murdered somewhere else and brought to the woods. But why? Then another young couple are found dead, again beautifully posed as lovers. 

Forensic archaeologist Ruth Galloway has excavated a body from the grounds of Norwich Castle, a forbidding edifice that was once a prison. She believes the body may be that of infamous Victorian murderess Jemima Green. Called Mother Hook for her claw-like hand, Jemima was hanged in 1867 for the murder of five children in her care. DCI Harry Nelson has no time for long-dead killers.

One night changes everything for Toby. A brutal attack leaves him traumatised, unsure even of the person he used to be. He seeks refuge at his uncle's rambling home, the Ivy House, filled with cherished memories of wild-strawberry summers and teenage parties with his cousins. But not long after Toby's arrival, a discovery is made. A skull, tucked neatly inside the old wych elm in the garden. 

A crime wave has hit town. The target is a highly sought-after brand of streetwear called Hybird X, clothing that costs a fortune and resells for unbelievable prices. Houses are burgled, kids mugged on the streets...and finally a young man dies, all for the sake of his shoes. Then another boy’s body is found in a pile of rubbish. Meanwhile illegal steroids are flooding the streets. And there are dark movements on the marshes. 

Detective Nikki Galena's friend and neighbor meets a tragic end, but there's more to his death than meets the eye. And someone terrible from DS Joseph Easter's past is back.