Twenty-five years ago, a young girl left home to walk to school. Her younger sister soon followed. But one of them arrived, and one of them didn’t. Her sister’s disappearance has defined Willa’s life. Everyone thinks her sister is dead, but Willa knows she isn’t. Because there are some things that only sisters know about each other—and some bonds only sisters can break. When Willa is invited to a party thrown by her first love, she has no reason to expect it will be anything other than an ordinary evening But nothing about Willa’s life has been ordinary since the day her sister disappeared.

Jade has the life she always wanted: a husband and three perfect children. She's happy. Except, recently that isn't enough. Then she unexpectedly finds herself reconnecting with Christina, an old friend from university, and she starts to feel like herself again. As the women become closer, and Christina needs a place to stay, Jade welcomes her into their chaotic family home. But when Jade discovers a suspicious text on her husband's phone, she soon starts questioning those around her.

When I first met David, I knew he was the one. We were the golden couple that everyone wanted to be. But recently, everything’s changed – he’s working late and is always glued to his phone. Is there someone else? Desperate for answers, I decide to follow him. I watch him move closer and closer to his beautiful younger colleague, Nina, and my worst nightmare is confirmed – my husband is having an affair. I have to find a way to save my marriage. Because if I don’t, I’m terrified a secret I’ve been keeping for all these years will be revealed.

I push open the door to the beautiful French villa and my clever, handsome husband and adorable wide-eyed children follow me inside, taking in the breath-taking view. This should be a blissful summer break, filled with sun, swimming and relaxation but the truth is very different. Because my husband has just revealed the real reason we’re here. When our friends staying at the sprawling villa greet us on the sun-soaked terrace, I smile brightly and attempt to calm my nerves.

The gorgeous French stone villa is just as I remembered it. I was anxious about coming back here after all this time. But as I see the faces of my best friends, I know I made the right decision. A weekend away is just what I need. That was until Frederick arrived… Putting on a smile, I pretend that his presence doesn’t affect me. But as I make my way down to an old wine cellar to get supplies for our first dinner together, I sense Frederick near me in the dim light. And then it happens: the old door swings shut, trapping us both inside.