Blythe Connor doesn't want history to repeat itself. Violet is her first child and she will give her daughter all the love she deserves. All the love that her own mother withheld. But firstborns are never easy. And Violet is demanding and fretful. She never smiles. Soon Blythe believes she can do no right - that something's very wrong. Either with her daughter, or herself. Her husband, Fox, says she's imagining it. But Violet's different with him. And he can't understand what Blythe suffered as a child. No one can. Blythe wants to be a good mother. 

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.

What do you do when you can't run and you can't hide? Lauren's daughter, Zara, witnessed a terrible crime. But speaking up comes with a price, and when Zara's identity is revealed online, it puts a target on her back. The only choice is to disappear. To keep Zara safe, Lauren will give up everything and everyone she loves, even her husband. There will be no goodbyes. Their pasts will be rewritten. New names, new home, new lives. The rules are strict for a reason. They are being hunted. One mistake - a text, an Instagram like - could bring their old lives crashing into the new.

Ellen was just trying to help a stranger. That was how it started: giving a few minutes respite to a flustered young mother sitting opposite her on the train. A few minutes holding her baby while the mother makes an urgent call. The weight of the child in her arms making Ellen's heart ache for what she can never have. Five minutes pass. Ten. The train pulls into a station and Ellen is stunned to see the mother hurrying away down the platform without looking back.

Beautiful twin sisters Iris and Summer are startlingly alike, but beyond what the eye can see lies a darkness that sets them apart. Cynical and insecure, Iris has long been envious of open-hearted Summer's seemingly never-ending good fortune, including her perfect husband, Adam. Called to Thailand to help sail the family yacht to the Seychelles, Iris nurtures her own secret hopes for what might happen on the journey. But when she unexpectedly finds herself alone in the middle of the Indian Ocean, everything changes.

Stephanie and Patrick are recently married, with newborn twins. While Stephanie struggles with the disorienting effects of sleep deprivation, there’s one thing she knows for certain - she has everything she ever wanted. Then a woman from his past arrives and makes a shocking accusation about his first wife. He always claimed her death was an accident - but she says it was murder. He insists he’s innocent, that this is nothing but a blackmail attempt. But is Patrick telling the truth? Or has Stephanie made a terrible mistake?

Una Richardson is devastated after the death of her mother. Hoping for a fresh start, she responds to an advertisement and steps into the rich, comforting world of elderly Mrs Elspeth McKenzie. But Elspeth's home is not as safe as it seems. Kathryn, her cold and bitter daughter, resents Una's presence. More disturbing is the evidence suggesting two girls lived here before. What happened to them? Why will the McKenzies not talk about them? As the walls close in around her, Una fears she'll end up just like the other girls.

Rachel is afraid she may have done something terrible. She's sitting in a room, being asked whether she killed someone. She doesn't understand how her life has changed so completely. When she was younger, heads would turn when she walked into a room. Her children needed her; her husband adored her. But somehow the years wore that all away. She was so busy raising her children, looking after her parents.... 

Immi thought she had found the perfect new home in Central London: a shared warehouse with luxury accommodation, a rooftop terrace and daily yoga, all with a surprisingly affordable price tag. The Dye Factory is a 'co-living' community, designed to combat the loneliness of big city life. But soon after she moves into her new haven, Immi realises that it's not quite as idyllic as it appears. No one seems to know who is behind this multi-million pound urban experiment. And her housemates may be hiding a dangerous secret.

On a cold, windswept night, Fiona arrives on a tiny, isolated island in Orkney. She accepted her old friend's invitation with some trepidation - her relationship with Madison has never been plain sailing. But as she approaches Madison's cottage, she sees that the windows are dark. The place has been stripped bare. No one knows where Madison has gone. As Fiona tries to find out where Madison has vanished to, she begins to unravel a web of lies. Madison didn't live the life she claimed to, and now Fiona's own life is in danger.

In Poppy Page's mind, there are two types of women in this world: those who are faithful to their husbands and those who are not. Until now, Poppy has never questioned which she was. But when handsome, charming Matthew Gordon walks back into her life after almost two decades, that changes. Poppy makes a single mistake - and that mistake will be far more dangerous than she could imagine. Someone is going to pay for it with their life.... 

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? 

Louise has had to watch her husband, Andrew, start a new family in the four years since he left her. The ‘other woman’ is now his wife - but Louise isn’t ready to let Caz enjoy the life that was once hers or to let go of the man she still loves. As Louise starts to dig into Caz’s past, the two women’s pretence of civility starts to slip. But in trying to undermine each other, they discover more about the man they both married. And when Andrew is murdered at a family party, both women are found standing over the body. It’s always the wife. But which one?

Emily and Jake are the perfect couple. Or so everyone says. But Emily just read a letter that has shattered her perfect world. Now she only has one thing on her mind. Which one of her friends is sleeping with her husband?

Leah’s perfect marriage isn’t what it seems, but the biggest lie of all is that she’s learned to live with what happened all those years ago. Marie drinks a bit too much to help her forget. And Carly has never forgiven herself for not keeping them safe.