When a 15-year-old girl fails to make it home after school, DI Heather Filson believes she’s dealing with just another teenage runaway. The girl’s grandfather, a notorious Glasgow gangster, disagrees. Convinced one of his underworld enemies has grabbed her, he’s prepared to bathe the city in blood in order to bring his princess home.

A lost girl. A mysterious house in Ireland. An invitation that changes everything. Twenty years ago, at the end of a hot long Irish summer, three sisters walk down to the cool lake at their home, Swan Hall. As Maeve and Aisling watch their beautiful younger sister Nuala laughing and splashing, it is hard to hide their envy of her. But later that morning, when Nuala drowns, they are devastated. Now, as Iris scatters the ashes of her beloved mother Aisling onto the golden leaves of Central Park, she feels very alone.

DI Nikki Galena: A police detective with nothing left to lose, she's seen a girl die in her arms, and her daughter will never leave the hospital again. She's gotten tough on the criminals she believes did this to her. Too tough. And now she's been given one final warning: make it work with her new sergeant, DS Joseph Easter, or she's out.

D.I. Duncan McAdam is dispatched home to the Misty Isle. A body has been found buried in a remote location on the Waternish peninsula. Well-preserved in the peat, Isla Matheson—missing for the better part of two decades—is revealed to a shocked island community. A teenage runaway is dead...and no one is talking.

Janey Markham is thrilled to be moving with her family to Buckingham Crescent, the smartest address in a desirable suburban town. Worried she’ll be excluded by the glossy local mothers, Janey is thrilled when she meets Tanya, the kind of woman she has always looked up to. Tanya takes Janey under her wing and her teenage daughter, Angel, is amazing with Janey’s little boy. As Janey and Tanya grow closer, Janey feels she can finally leave her troubled past behind.  

It’s Katie’s 17th birthday – the dancefloor is packed, the drink is flowing and Raven’s Hill School confession site is alight with gossip. Then a huge fight breaks out, sending guests fleeing. When Frankie, Jess and Sorcha go back to help Katie clear up her wrecked house before her parents get home, they find more than broken bottles… There’s a body on the living room floor.

It's June 2008 and 21-year-old Adam Lattimer vanishes, presumed dead. The strain of his disappearance breaks his already fragile family. Ten years later, with his mother deceased and siblings scattered across the globe, Adam turns up unannounced at the family home. His siblings return reluctantly to Spanish Cove, but Adam's reappearance poses more questions than answers. The past is a tangled web of deceit. And, as tension builds, it's apparent somebody has planned murderous revenge for the events of 10 years ago.

When Matt Ballard was starting out his career, three boys were murdered in the same area, the remote and bleak Gibbet Fen. When the main suspect was killed in a hit-and-run, the killings stopped. But Matt was not satisfied that the real murderer had been caught. Over 25 years later, Matt gets a photo in an unmarked envelope. It's of the Gibbet Fen crime scene. And the picture was taken before the murder took place. More photos arrive, relating to the historic murders, as well as intimate pictures of Matt's very secret private life.

When a woman's body is discovered in a cathedral and hours later a young man is found hanging from a tree outside his home, Detective Lottie Parker is called in to lead the investigation. Both bodies have the same distinctive tattoo clumsily inscribed on their legs. It's clear the pair are connected, but how? The trail leads Lottie to St Angela's, a former children's home, with a dark connection to her own family history. Suddenly the case just got personal.

On a leafy suburban street in Dublin, beautiful, poised Stella Greene lives with her successful husband, Matt. They're the perfect couple in every way, and Stella appears to have it all. Next door, at number 72, however, lives Rea Brady. Gruff, bad tempered and rarely seen besides the twitching of her net curtains, rumour has it she's lost it all...including her marbles, if you believe the neighbourhood gossip. But appearances can be deceiving, and when Stella and Rea's worlds collide they realise they have much in common.