Anne gets exactly the welcome to the neighborhood she expects: a basket of homemade cupcakes delivered by the woman next door and her best friend. One wears a curious smile while the other studies her every move. When Talia and Tabitha leave, Anne throws the treats in the trash. She knows what to expect from the new neighbors. Talia with her perfect husband and pale-peach sweater sets, and Tabitha who reigns as queen in the close-knit community. That’s why she chose this house.

Everyone knows about the fight between Kathleen Walsh and her sister on the night she disappeared. For six months, no one has heard from Kathleen. Not her bullying husband, not her teenage son, and not her devastated sister Siobhan. But then Kathleen’s purse is found by a walker high up on the rocky Irish sea cliffs. The only thing inside is a torn scrap of paper with the words ‘HELP ME’. For Siobhan, it’s a chance to find her sister and fix the mistake she made six months ago. But not everyone in the tight-knit community welcomes Siobhan’s interest in the disappearance.

I open the front door and there’s Amy, smiling sweetly and ready to help. She’s been a lifesaver since Jon and I moved here–from walking the dog to picking up my little son Teddy from nursery last minute. I’m so lucky we met in the playground the first day we arrived. Amy is more than just a good friend. My only friend, really. Whenever Amy and Jon exchange glances I’m sure it seems like they’ve met before, even though Jon swears they haven’t. But then again Jon recognises lots of people from his childhood round here without truly knowing them.

On a sunny Friday afternoon, beloved teacher Mrs Walker and her eight-year-old son wave goodbye to their friends in the school playground. But they never make it home. It’s only been a week, but the bright little faces at the picture-perfect school I’ve stepped into have captured my heart. Their big doe eyes, their paint-covered fingers and clinging hugs. They’ve been through so much, with their favourite teacher and classmate still missing. I’m doing all I can to help them adjust, but I can’t avoid the rumours that say Cate Walker’s charismatic husband is involved in her disappearance.

Sharon Stevenson is a forensic psychiatrist. Her job is to decide whether a patient is of sound enough mind to stand trial, not whether they did or didn’t commit a crime. But Sharon is also a mother grieving the disappearance of her seventeen-year-old daughter, Maddie, who has never been found. And what if the man sitting before her, who has been charged with the murders of several women, also claimed the life of her sweet girl? It’s time to find out the truth.

Hidden away in an isolated cabin on the edge of her farm, seven-year-old Aisling Connolly shivers as the cold night air whistles through her thin jacket. It’s been two days since the men came, since her mammy told her to run like she’d never run before, to not look back. She hasn’t seen her parents since. And she’s terrified. But when Aisling is finally found by the police, she knows instinctively she can trust Detective Tessa Burns.

When Detective Billie Ann Wilde receives a desperate call that five-year-old Emma Wilson is missing, she rushes to the family home. But inside the picture-perfect house surrounded by Florida marshlands, she finds no children’s clothes or toys, no photos of the innocent child Emma’s mother Marissa describes. Billie suspects Marissa Wilson is hiding from someone.

Everything my husband and I have always dreamt of has finally come true. Our new home with its open-plan kitchen and marble countertops couldn’t be further from the small, damp flat where we lived only months ago. I’d hoped this would be our fresh start, an escape from my past, but the handwritten note that arrived on our doorstep makes my blood run cold – you don’t deserve this life.

A bright and welcoming haven, the playgroup sits at the heart of the town, tucked away inside a red-brick building. The Nest should have been the safest place for my rosy-cheeked, pink-obsessed daughter, Florence. Run by mothers like me, I trusted my newfound friends–Alice, Beth and Georgie–to take care of my child. But now my choice has left Florence fighting for her life.

I know Benjamin’s new business is in trouble, that he desperately needs your money. I saw the way Gwyn looked at him at your wedding reception, finding any excuse to be close, to laugh too loudly at his jokes. After all, she always wanted your perfect life. But don’t worry, Madeline. I won’t let it end like this. I can see everything from my place in the shadows between the trees. With their house lit up, they are on display. I’ll bide my time and worm my way into their home, their lives. They will never know the truth about who I am.

Detective Sam Helsdown hasn’t seen his daughter Zoe in two years and he’s excited and more than a little nervous to be at the airport picking her up for a visit. She’s 10 years old and has flown on her own for the first time. Flight BA631 from Athens has already landed and soon a trickle of people begins entering Arrivals. Among them is a little girl who runs towards him, head down, and throws herself into his arms saying ‘Daddy!’. But then he looks at her properly. This is not Zoe. This is not his daughter.

On a crisp winter evening, Detective Nikki Gill is taking a peaceful stroll through New College Oxford grounds before starting her new job at Kidlington Criminal Investigations unit the following day. But when she hears a blood-curdling scream coming from one of the buildings, she discovers the lifeless body of Professor Brian Allerton in his office and his wife kneeling by his side. With her first case already underway before she's officially begun her new role, Nikki is feeling the pressure.

My husband is lying. The minute he came home with alcohol on his breath and unable to look me in the eyes I knew it. We used to be in love–the intense ‘I can’t be without you for a second’ kind. Where it hurts deep to be apart. But now, we’re the couple that keep secrets from each other. We hide the truth. He thought I wouldn’t find out. I’m a detective–it’s literally my job to uncover clues and solve mysteries. I know what he did. And now I’m sitting here, in a police interview, being asked the question ‘did you kill her?’ to which I utter one life-shattering word: ‘yes.’

I was so nervous about someone new joining our house share. After everything that happened with my parents, my friends are like my family. Our imperfect, but well-loved house is the only place where I can be myself. But when Poppy knocks on our door, blonde hair, wide eyes, and a friendly smile, we all agree she’s a perfect fit. I just wish I could shake the feeling that I’ve seen her before…

Ethan gently squeezes my hand as he slides the golden ring onto my finger. But I know we aren’t worthy of happiness. As I look down at my wedding ring, in a blistering flash, I suddenly remember another piece of that pitch-black, rainy night… but I try to focus on Ethan’s gorgeous blue eyes. I know exactly what he’s thinking. We can never tell. All our family, friends and loved ones smile as they watch Ethan and I promise to be together until death us do part. But only we know what that really means…Because we have already killed someone.