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.

Everyone in the small town of Denton is searching for Isabelle Coleman, a missing 17-year-old girl. All they've found so far is her phone and another girl they didn't even know was missing. Mute and completely unresponsive to the world around her, it's clear this mysterious girl has been damaged beyond repair. All Detective Josie Quinn can get from her is a name: Ramona. Currently suspended from the force for misconduct, Josie takes matters into her own hands as the name leads her to evidence linking the two girls.

Melody gazes across the rippling lake to the trees on the shore, waiting for her fiancé Evan to arrive so their family holiday can begin. Here in this cabin in a small Canadian island town, there’s so much space for their son to play. It’s going to be perfect–just like the first time Melody visited as a child. But then, a call from Evan shatters her world.

I stare at the messages between my husband Rob and another woman, their plans to run away together bringing tears to my eyes as I stand, trembling, in our luxurious apartment. I thought I had the perfect marriage. As our three beautiful children sleep soundly in the next room, I think about our family holidays, our romantic date nights, and the day Rob proposed to me. In the last few months, I haven’t complained about his late-night meetings or got jealous about his weekends away. I trusted my husband. But now I’m questioning everything.

I gaze across the candlelit table into the eyes of the man I love. It’s our anniversary dinner, a celebration of our marriage, of how far we’ve come. But within hours our romantic date has ended in murder… When I wake in a hospital bed, blinking under the blinding white lights, I hear someone saying there has been an accident. My heart misses a beat when I recognize my husband’s voice. He says I was driving the car. He says I’ve killed someone.

Last night, we celebrated our anniversary. Over candlelight, we talked about the children, our work, and I was so happy, and felt so loved. But the next morning, when I check my phone, there is a message. From a friend. And a string of photos appear of my husband, Will, with another woman: walking along the street holding hands. Going into fancy hotels. Standing at a window, his arms around her, her head on his shoulder…

My husband is a doctor. He’s smart and charming, and everybody trusts him. Except me. On the surface, it looks like I have it all–the perfect marriage, the perfect husband, the perfect life. But it’s far from the truth. Doctor Drew Devlin is not the respectable figure he makes out to be. The reason we moved to this beautiful, old property with a gorgeous view of the sea was because we needed to put our past behind us. It should’ve been a fresh start for us both.

My hand trembles as I stare at the anonymous text. On this sunny Saturday morning, our twin ten-year-old boys were playing in the park just down our tree-lined street. But only one of them has come home… and it’s all my husband’s fault. I race to Leo’s study and demand answers. As his face turns white, I know: one of his affairs has turned deadly. I always smell the unfamiliar perfume on his shirt. I try to pretend we are a happy family, for the sake of the children… but now, my child is in terrible danger.

Everyone thinks I’m living the perfect life. I have my dream job, a stunning apartment, and glamourous friends – who know nothing about my dark past. So I’m shocked when I run into Anna, who I haven’t seen in eighteen years. Everything about her reminds me of the life I’ve left behind. But as her eyes fill with tears and she tells me she’s lost her job and can’t pay her rent, I reluctantly offer her my spare room.

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.

As I board the plane, all I can feel is hope and excitement. One whole week away. Just me and the man I have promised to be with forever. Time to repair what has been broken. Maybe even try for another baby, and pray that this time it doesn’t end heartbreakingly. I just need to not think about what George has done. He’s my husband. And this is the holiday where we make things right. But then I realise he can’t take his eyes off the beautiful woman who’s just boarded the plane in front of me. In that moment, everything changes. And nobody is safe.

Just six hours ago, Alex and I were married. It was a beautiful wedding by the sea, on the beach we’ve always loved. Our guests crowded outside our beach hut to raise a toast before our first midnight swim together as man and wife. And then, suddenly, he was gone, drowning in the water that meant so much to us.

The invitation to her school reunion couldn’t have come at a better time for Chloe Flynn. Divorced, broke and bored at work, she’s living a life her teenage self would hate. Turning the clock back fifteen years might be just what she needs to wipe the slate clean and start again. And then there’s the chance she’ll bump into Nathan Blake, the one she still regrets letting get away…

I close the binder I’ve been writing in, and walk into the living room. As I stare out of the window at your house next door, I think about all the things I stand to lose if someone comes for me. My handsome, loving husband, who has no idea what I’ve done. My family, who have supported me no matter what. This beautiful home near the ocean, where I thought I would be safe.

I tell myself that Max couldn’t kill anyone. He’s a family man now, different to who he was before. Even so, I should go to the police right away. But I can’t. Because if I do, I’m scared they’ll start to suspect me. How much do I really know about the girl in room 12? And if the truth comes out, how far will I go to protect my precious family?