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.

On a Dublin city street, packed with afternoon Christmas shoppers, a young woman appears, naked, traumatised and bearing burn marks. Tom Reynolds, now chief superintendent, is no longer head of the murder squad. But when it transpires the woman escaped from a house fire started deliberately and that there are more victims, including a baby, Tom is sucked in. What begins as a straightforward case of arson, soon becomes something much more sinister. The people in that house never wanted to be there in the first place. Now more of them are missing.

Christmas day, and DCI Tom Reynolds receives an alarming call. A mass grave has been discovered on Oileán na Caillte, the island which housed the controversial psychiatric institution St. Christina's. The hospital has been closed for decades, and onsite graves were tragically common. Reynolds thinks his adversarial boss is handing him a cold case to sideline him. But then it transpires another body has been discovered amongst the dead - one of the doctors who went missing from the hospital in mysterious circumstances 40 years ago.

Death stalked the Vale. In every corner, every whisper. They just didn't know it yet. Six neighbours, six secrets, six reasons to want Olive Collins dead. In the exclusive gated community of Withered Vale, people's lives appear as perfect as their beautifully manicured lawns. Money, success, privilege - the residents have it all. Life is good. There's just one problem. Olive Collins' dead body has been rotting inside number four for the last three months. Her neighbours say they're shocked at the discovery, but nobody thought to check on her when she vanished from sight. 

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.

Pete Riley is a stay-at-home dad; his partner, Maddie, works in advertising. After Pete drops two-year-old Theo off at nursery one morning, he's politely accosted by a man who looks just like Theo. The man, Miles Lambert, breaks the devastating news that Theo is in fact not Pete's son, but his - the two babies got mixed up at hospital and Miles and his wife, Lucy, now have the Rileys' son at home. They've already carried out DNA testing to prove it.

Kids can be so cruel. They'll call you names. Hurt your feelings. Push you to your death. In the garden of an abandoned house, Luke Connolly lies broken, dead. The night before, he and his friends partied inside. Nobody fought, everybody else went home safely. And yet, Luke was raped and pushed to his death. His alleged attacker is now in custody. DCI Tom Reynolds is receiving the biggest promotion of his career when a colleague asks him to look at the Connolly case, believing it's not as cut and dried as local investigators have made out.

Late at night, two powerful men meet in a secret location to discuss a long nurtured plan about to come to fruition. One is desperate to know there is nothing standing in their way - the other assures him everything is taken care of. Hours later, a high-ranking government official called Ryan Finnegan is brutally slain in the most secure building in Ireland - Leinster House, the seat of parliament. Inspector Tom Reynolds and his team are called in to uncover the truth behind the murder.

When DI Rowan Jackman and DS Evans are told that the IT boss has disappeared, they soon suspect foul play. Orla Cracken, known as Orac, is no ordinary techie; she was once a field agent traveling abroad undercover, working for the government. Meanwhile DC Robbie Melton discovers that two people, both urban explorers, have mysteriously disappeared whilst out exploring abandoned buildings. One went missing at a disused airfield, but was it a military base, or was it civilian?

For 15 years, Lexi and Jake have played the same six numbers with their friends, the Pearsons and the Heathcotes. Over dinner parties, fish & chip suppers and summer barbecues, they’ve discussed the important stuff – the kids, marriages, jobs and houses – and they’ve laughed off their disappointment when they failed to win anything more than a tenner. But then, one Saturday night, the unthinkable happens. There’s a rift in the group. Someone doesn’t tell the truth. And soon after, six numbers come up which change everything forever. 

From the outside, the Delaneys appear to be an enviably contented family. Even after all these years, former tennis coaches Joy and Stan are still winning tournaments, and now that they've sold the family business they have all the time in the world to learn how to 'relax'. Their four adult children are busy living their own lives, and while it could be argued they never quite achieved their destinies, no-one ever says that out loud.

Suzi did a bad thing. She’s paying for it now, pregnant, scared, and living in an isolated cottage with her jealous husband, Nick. When Nora moves into the only house nearby, Suzi is delighted to have a friend. So much so that she’s almost tempted to tell Nora her terrible secret. But there’s more to Nora than meets the eye. It’s impossible - does she already know what Suzi did?

Nina once bought into the idea that her fancy liberal arts degree would lead to a fulfilling career. When that dream crashed, she turned to stealing from rich kids in LA alongside her wily Irish boyfriend, Lachlan. Nina learned from the best: Her mother was the original con artist, hustling to give her daughter a decent childhood despite their wayward life. But when her mom gets sick, Nina puts everything on the line to help her, even if it means running her most audacious, dangerous scam yet. 

It's 1975. A baby, minutes old, is forcibly taken from its devastated mother. In 2010, the body of an elderly woman is found in a Dublin public park in the depths of winter. Detective Inspector Tom Reynolds is working the case. He's convinced the murder is linked to historical events that took place in the notorious Magdalene Laundries. Reynolds and his team follow the trail to an isolated convent in the Irish countryside. But once inside, it becomes disturbingly clear that the killer is amongst them....

Abbie awakens in a daze with no memory of who she is or how she landed in this unsettling condition. The man by her side claims to be her husband. He’s a titan of the tech world, the founder of one of Silicon Valley’s most innovative start-ups. He tells Abbie that she is the perfect wife. He says she had a terrible accident five years ago and that, through a huge technological breakthrough, she has been brought back from the abyss. But as Abbie pieces together memories of her marriage, she begins to question her husband’s motives - and his version of events.