I didn’t turn up uninvited. He asked me to come. He didn’t need to ask twice. He knew I’d agree. Kind Laura. Obedient Laura. Laura the soft-spoken schoolteacher with the faded cardigans and flat shoes. Nobody ever suspected someone like me would appeal to handsome, charismatic, happily married Ralph. I think even he was surprised by his choice. But I’m used to people underestimating me. But then maybe I underestimated Ralph, too. Because I never thought he’d be capable of doing what he did. It wasn’t only dangerous, it was very, very wrong. 

Jenna is a wife, a mother, a doctor. She’s also the victim of a stalker. Every time she leaves her house, she sees him. Disturbing gifts are left at her door. Cruel emails are sent to her colleagues. She has no idea who this man is, but she feels powerless against him. Until the day he is brought into her hospital after a serious accident, and Jenna is given the chance to find out once and for all why this man is tormenting her. Now, the power is all hers.

Cassie stares at the woman on her doorstep in disbelief. Just months after losing her only son, Josh, here stands a stranger claiming to be Josh’s girlfriend. But it’s not only the woman Cassie is shocked by, it’s the baby nestled in Kim’s arms. Cassie’s grandchild. I know what you did. As Cassie tries to do what’s best for baby Samuel, she starts to receive threatening messages from someone from her past - someone Cassie has been hiding from for a long time.

Gloria is used to solitude. Widowed and still grieving her late husband, she spends her days with only her faded photographs for company. But when a young woman is murdered nearby, Gloria grows anxious. Living alone in old farmhouse, surrounded by empty woods, there’s no one for miles who would hear her scream. When freelance travel writer Beth arrives with her trailer to live on Gloria’s land, Gloria is relieved not to be alone. The police have no suspects in the murder, and fearless Beth makes Gloria feel safe. 

Who took Lucia Blix? Lucia went home from school with her new friend Josie for a playdate. Later that evening, Lucia's mother, Elisa, dropped her overnight things round and kissed her little girl goodnight. That was the last time she saw her daughter. The next morning, when Lucia's dad arrived to pick her up, the house was empty. No furniture, no family, no Lucia. Have you seen Lucia?

The moment my husband showed me Cliffside - a sleek and modern glass home perched on the edge of the jagged Big Sur clifftops - I fell in love. And right there and then I made a pact with myself. I am never leaving this house. But when my husband was killed on the perilous roads leading up to the house, weeks after we moved in, I had a decision to make - leave the home I love and start a new life or stay and shut myself off from the world? I am never leaving this house. 

I watched you move in next door and thought we might be friends. I saw you watching from the window - and knew I’d have to keep you well away from my husband. I started to trust you. Confide in you. I started to mistrust you. Suspect you. I was confused when I blacked out after an evening at your place. Was I really that drunk? I came up with a plan. A plan to make you both pay.

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?

Sara made one promise to herself when she was growing up in foster care: that if she was lucky enough to have a family, she’d always do whatever it took to protect them. Looking around her home with its cozy kitchen and living room, where her energetic teenage daughters and gorgeous 4-year-old son all eat, play and live together, she knows she’d do anything to keep them safe. So when Sara’s husband Matt loses his job and every shred of his confidence with it, she knows it’s up to her to bring the family back from the brink.

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.

It’s Julia’s wedding day. Her nerves are to be expected - every bride feels the same - but there’s another layer to her fear, one that she cannot explain to her soon-to-be husband, Mark. She’s never told him the details - and she is determined he never finds out. As she begins down the aisle, spotting Mark in his tailored suit, she knows she is taking her first steps to happiness - her past is behind her, it can’t catch her now. Mark turns to face her. But it isn’t Mark in the beautiful suit - it’s his best man. Because Mark is missing.

Kate and Lauren. Sisters who are always there for each other. But as they gather for their weekly Sunday lunch, a knock on the door changes everything. The new arrival, Jess, claims to be their half-sister, but that would mean the unthinkable. That she’s the secret daughter of their beloved, recently deceased father, Harry. Their mother, Rose, is devastated and Kate and Lauren refuse to believe Jess’ lies. But as the fall-out starts, it’s clear that each is hiding secrets and that perhaps this family isn’t as perfect as they appear.

Abby and Ellie were never close as children. Now in their thirties, they each harbour deep-rooted resentment for the other - Abby for her sister's looks and her status as their mother's favourite. Ellie meanwhile is envious of Abby's perfect husband and picturesque home, a villa on the sun-soaked Italian island of Elba. When Abby invites Ellie to stay, both sisters see the break as a chance to relax and put aside their differences. But with their mother Susanna there too, all the simmering tensions of the past quickly rise to the surface. 

They say she’s guilty. She says she’s not. Who do you believe? "Help me! Help me, please!" When Jenna hears the cry in the park one night, she feels she has no choice but to run and help. Cradling the injured woman in her arms, the attacker nowhere to be seen, all Jenna wants is to keep her alive until the ambulance arrives and for the ordeal to be over. But the nightmare begins when the victim wakes up...Jenna’s relief turns to horror when the finger is pointed at her. There must be some mistake: She’s never seen the woman before in her life, and Jenna tried to save her life.

On the hottest day of the year, Caroline Harvey is found dead in Suffolk. Her body is found draped over a cot - but the baby she was looking after is missing. Hundreds of miles away, Siobhan Dillon is on a luxurious family holiday in France when her husband, Callum, is arrested by French police on suspicion of murder. As Siobhan’s perfect family is torn apart by the media in the nation’s frantic search for the missing baby, she desperately tries to piece together how Callum knew Caroline.