Young married couple Heidi and Freddie just moved to Huntington Grove. All the neighbours see they are friendly and polite but why is one door in their house always locked? Across the street, Willow tries not to argue with her teenage daughter – even as her marriage is falling apart. And where does her husband really go each night, leaving the bed beside her cold?

Riley Bishop is a single mother, working at home as a graphic designer to provide for her two children, Sadie and Oliver. But something is very wrong. Riley starts forgetting things—like appointments, where she put her keys, and where she parked her car. And then she thinks she sees her deceased ex-husband while out shopping. But as Riley begins to question her own sanity, her twelve-year-old Sadie goes missing. Soon Riley finds it harder and harder to know what is truth and what are lies as she is forced to question her own reality while she searches for her daughter.

ME: Staring down at the sweet baby in my arms, I feel panic instead of love. Because this isn’t the child I gave birth to. My husband whispers to the midwife. They all think I’m going crazy. But the tiny boy in my arms is crying again. I’m certain: he knows I’m not his mummy. And I’ll do whatever it takes to get my son back.

Sweet little Emma and Nealie, both just four years old, live on the same block in the exclusive, gated Blackwood neighborhood—miles from my cramped studio apartment. I go between each family’s home to care for the girls. And I know all their secrets… Their mothers were best friends until three months ago, when everything fell apart. There’s a door that’s always locked at Nealie’s house. And Emma’s house is filled with whispered arguments. I’m sure her father is having an affair.

When we move to the exclusive Cutters Island, my life changes overnight. Dressed like the perfect wife, pushing my baby down the street in her pink stroller, I look up and smile at the security cameras. Because I know they are watching. And for now, I need to play my part.

I am on my way home, thinking only of the quiet, happy evening to come, when I see something completely impossible, and my heart stops dead. I would recognise those gorgeous pale blue eyes anywhere. It’s him. The high-school boyfriend I adored… Until the day he vanished without a trace. I run towards him, my pulse racing. He turns, politely, a puzzled look on that familiar face. ‘I’m sorry,’ he says. ‘Do I know you?’ I need answers. I’m certain he’s lying. I just have to prove it.

This is the day my life changes forever. It started so normally. The alarm went at 7am. My husband made bacon and pancakes for me and our seven-year-old daughter, the kitchen full of chatter and laughter. He gave me a quick kiss, told me he loved me, grabbed his wallet, and rushed off to work. Just an ordinary day. Until I get the call from the school. It was Tom’s turn to pick up our daughter. He must be held up for some reason. I find Tom’s phone under our bed. Now I know there’s something seriously wrong. I scroll through his messages. A text sent late last night: I KNOW EVERYTHING.

I take a sip of coffee as I plan my day. My surgeon husband, Cole, slept at work last night, so I had to get the kids ready on my own, again. I can’t complain, though, I’ve loved him ever since we met, long before he became a famous surgeon and the papers started calling him the pride of the hospital. Our latest family photo hangs on the kitchen wall and I remember that day so clearly. Cole screamed at me over nothing, then apologised saying he was stressed at work. My heart pounded with fear, but I plastered a smile on my face for the sake of my children.

In the glow of their children’s exciting first year of college at a small private school in Northern California, five families plan on a night of dinner and cocktails for the opening festivities of Parents Weekend. As the parents stay out way past their bedtimes, their kids—five residents of Campisi Hall—never show up at dinner.

When Megan loses her beloved husband, Rick, in a tragic car accident, she feels like it’s her own life that has ended. She feels too young to be a widow. Walking around the house that had been their home – so quiet without him – nothing feels the same. But at his funeral, she sees a face she doesn’t recognise. A heavily-pregnant young woman, with a sweet heart-shaped face that is somehow a little familiar. This stranger introduces herself as Emily, Rick’s estranged sister. She explains how she’s been searching for her brother for years, but she knows she’s too late now.

Every day, Mary wakes up before dawn to make breakfast from scratch. She tends the garden and feeds the animals. Every night, Mary makes sure she has dinner on the table for when her husband Cal gets home from work. She puts on his favourite lipstick and greets him with a smile. 'I've missed you.' It's not true and he knows it. But he likes to hear it all the same. Their cabin is hidden deep in the woods in the Scottish Highlands, and Mary doesn't remember the last time she saw another living soul. She tries not to think about her life before too much.

I’ve been married to my kind, loving husband Lachlan for over twenty years. He’s my everything. We have two teenage children, a beautiful home and I feel so lucky to live this perfect life. Until my best friend says something that makes me doubt everything… She whispers it’s strange Lachlan has lived nearby to two unsolved murder cases. First, the murder of the woman in the small, Scottish village where he grew up and more recently the shocking death of a woman who lived round the corner from us. The thought makes my head spin. It’s just a coincidence, surely?

Cecilia has it all. The house on the beach. The cute figure. The beautiful baby. But she’s a long way from perfect. She’s let me into her gorgeous house as her nanny because now she’s on her own, she needs a little help with her baby daughter Peyton. She barely notices me. But I see everything. While Peyton naps, I rifle through her drawers and discover the dark secrets in her past, the threatening letter from her ex-husband. It's a shame that Cecilia doesn’t have my powers of observation. If she took some time, she might just recognise me. I’ve been following her for a while, after all.

I thought my first husband was dead. But when I get a letter with his name on it just days before my wedding, it will tear my perfect new life apart… As we drive up to the gorgeous house by the lake with its red and yellow roses round the door, I breathe in the pure air and count my blessings. In two days’ time I’m getting married to Matt, my soulmate and the father of my beautiful boy. After all the pain of my past, my life now is perfect.

Saffy is waiting to go into an important meeting when she receives a missed call and then a text message from her best friend, Leona: Please help...come now. Of course, she races to her friend’s house. But when she arrives, she notices something strange. This message was deleted. Leona answers the door, and insists everything's fine. She doesn't know anything about the message. Six hours later, Saffy gets a knock on the door. It's the police. They’ve found a body. And Saffy was the last one to see them alive.