Owen Pick’s life is falling apart. In his 30s and living in his aunt’s spare bedroom, he has just been suspended from his job as a teacher after accusations of sexual misconduct - accusations he strongly denies. Searching for professional advice online, he is inadvertently sucked into the dark world of incel forums, where he meets a charismatic and mysterious figure. Across the street from Owen lives the Fours family, headed by mom Cate, a physiotherapist, and dad Roan, a child psychologist. But the Fours family have a bad feeling about their neighbor Owen.

Leah has spent her formative years isolated on a remote island with her family. But their quiet existence, far from the devastated mainland, is cracking. Father, sensing a coming threat, demands that a wall be built. As the stone blockade rises, Father’s paranoia escalates. So does Leah’s dread that the violence the family left behind has found its way to their sanctuary. 

Hannah has done everything to make sure her life is safe and secure. A long way from her unstable childhood growing up in foster care, she’s content with her sweet, little, messy apartment and her satisfying job as a social worker. She quietly worries that, aged 36, she might never fall in love. But otherwise her life is where she wants it to be. Until, encouraged by her best friend to join a dating app, she meets Alex. He’s irresistibly handsome. He loves the same music as her. The same food as well. 

Selena Murphy is commuting home on the train when she strikes up a conversation with a beautiful stranger in the next seat. The woman introduces herself as Martha and soon confesses that she’s been stuck in an affair with her boss. Selena, in turn, confesses that she suspects her husband is sleeping with the nanny. When the train arrives at Selena’s station, the two women part ways, presumably never to meet again. Then the nanny disappears. 

Stephanie and Patrick are adjusting to life with their colicky twin girls. The babies are a handful, but even as Stephanie struggles with the disorientation of sleep deprivation, there's one thing she's sure of: She has all she ever wanted. Then Erica, a woman from Patrick's past, appears and makes a disturbing accusation. Patrick had always said his first wife's death was an accident, but now Erica claims it was murder. Patrick insists he's innocent, that this is nothing but a blackmail attempt. Still, Erica knows things about Patrick.

On a cool June morning, Isa Wilde, a resident of the seemingly idyllic coastal village of Salten, is walking her dog along a tidal estuary. Before she can stop him, Isa's dog charges into the water to retrieve what first appears to be a wayward stick - and to her horror, Isa discovers it's not a stick at all...but a human bone. As her three best friends from childhood converge in Salten to comfort a seriously shaken-up Isa, terrifying discoveries are made, and their collective history slowly unravels.  

When Rowan stumbles across an ad for a live-in nanny, she’s looking for something else completely. But it seems like too good an opportunity to miss - with a staggeringly generous salary. And when she arrives at Heatherbrae House, she is smitten - by the luxurious "smart" house fitted out with all modern conveniences, by the beautiful Scottish Highlands, and by this picture-perfect family. What Rowan doesn’t know is that she’s stepping into a nightmare - one that will end with a child dead and Rowan in prison awaiting trial for murder.

Harriet Westaway - better known as Hal - makes ends meet as a tarot reader, but she doesn’t believe in the power of her trade. On a day that begins like any other, she receives a mysterious and unexpected letter bequeathing her a substantial inheritance. She realizes quickly that the letter was sent to the wrong person - but she also knows that she can use her cold-reading skills to potentially claim the money. Hal attends the funeral of the deceased and meets the family...but it dawns on her that there is something very, very wrong about this strange situation.

January 1992. A baby girl is left alone for a moment. Long enough for a mother to dash into a shop. Long enough for a child to be taken. Thirteen years later, solicitor Robert Knight's stepdaughter wins a place at a prestigious London school for the gifted. The only puzzle is his wife Erin's reaction. Why is she so reluctant to let Ruby go? Doesn't she want what's best for her? As Erin grows more evasive, Robert can't help but feel she has something to hide and when he stumbles on mysterious letters, he discovers she has been lying to him. 

When she was 9 years old, Melody Browne's house burned down, and it took all of her childhood memories with it. Now she's a single mother of a teenage boy living in Central London. She hasn't seen her parents since she left home at 15, but she doesn't mind. She's better off on her own. She works as a dinner lady at her son's school and has no idea where her humdrum life is heading. But one summer's night, a hypnotist inadvertently unlocks memories of her childhood, and her whole life is turned upside down.

Pete Riley answers the door one morning and lets in a parent's worst nightmare. On his doorstep is Miles Lambert, a stranger who breaks the devastating news that Pete's son, Theo, isn't actually his son - he is the Lamberts', switched at birth by an understaffed hospital while their real son was sent home with Miles and his wife, Lucy. For Pete, his partner Maddie, and the little boy they've been raising for the past two years, life will never be the same again.

During the languid days of the Christmas break, a group of 30-something friends from Oxford meets to welcome in the New Year together, a tradition they began as students 10 years ago. For this vacation, they’ve chosen an idyllic and isolated estate in the Scottish Highlands - the perfect place to get away and unwind by themselves. They arrive on December 30, just before a historic blizzard seals the lodge off from the outside world. Two days later, on New Year’s Day, one of them is dead.

No relationship is perfect. But since the birth of baby Mabel seven months ago, Amber and George have been in desperate need of a night away. Mabel is all that Amber has ever wanted, but she can’t deny that sometimes she struggles to cope. George has booked them into a luxury hotel, and Amber’s sister is babysitting. Yet just as they are ready to leave, Amber can’t suppress a feeling of worry.... 

It was supposed to be the happiest day of her life. Zoe was sitting in her hotel room, in her perfect white dress, looking forward to the moment when she would make kind, handsome Toby her husband. Then, there was a blank. They said she must have fainted, overcome with emotion. But nothing felt quite right afterward. Did something happen in that missing time? 

There are two sides to every story: yours and mine, ours and theirs, his and hers. Which means someone is always lying. When a woman is murdered in Blackdown, a quintessentially British village, newsreader Anna Andrews is reluctant to cover the case. Detective Jack Harper is suspicious of her involvement, until he becomes a suspect in his own murder investigation. Someone isn’t telling the truth, and some secrets are worth killing to keep.