A down-on-her-luck waitress at a posh New Jersey country club, Kim Valva couldn’t be living a more different life from the carefree socialites she serves. Her live-in boyfriend recently cheated on her, her social life is in shambles, and her dog needs a life-saving surgery that she can’t afford. Then her luck seems to change when a mysterious figure identifying themself only as The Stranger contacts her with an offer she can’t refuse: Put a pill in the new member’s drink and, when he dies, she’ll have enough money to fix her dog and her life.

When Julie Buckley, a successful mystery writer, suspects her husband of cheating, she turns to her best friend, Darby, for advice. When Darby suggests couples therapy, Julie and Oliver find themselves discussing Oliver’s betrayal with their new therapist, Liza. Liza is competent and reassuring, and her advice and Oliver’s openness to change seem to be helping the couple rebuild their relationship.

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.

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.

On the last day of school, my friends and I gather on the beach to celebrate the long summer ahead. Sipping cans of warm cider and watching campfire embers dance into the inky sky, I don’t think I’ve ever been happier. Until a scream pierces the night. The next morning, we find shy newcomer Pippa on the beach, sandflies gathering on her lifeless body…

Ten years ago: On a warm summer’s evening, four childhood friends gather at a slumber party.... Before dawn breaks, the nightmare begins. One of them dies. One of them is a killer.

Emma and I were inseparable. Growing up, we did everything together. Until the unspeakable night that everything changed. So I ran away—from my mom, my sister, everything I knew, and Emma and I haven’t spoken since. My sister, Lily, was at the beach that night too. She hasn’t been able to utter a single word since. That was 10 years ago. Now, Mom and Lily need my help, and I realize I can’t run from the past forever. I’m ready to talk to Emma, ready to try to move on.

Sabrina Adams thought her luck had finally turned around when she was hired as a librarian for the wealthy Dorsey family. But as soon as she arrives at their elegant estate, she senses something is off. They have cameras everywhere. She’s banned from the third floor, and she spotted someone watching the house from the nearby woods. And why does the housekeeper, Mrs Manning, insist on so many rules?

They say I’m lucky to be alive. But the only thing I can remember are the faces of my husband and baby. The husband and baby they insist don’t exist … I can hear a door slamming, and the low hum of distant traffic. I struggle to open my eyes, and the panic sets in. I have no memory of who I am, why I’m here, where all this pain is coming from …

For better or for worse, Sarah Anderson has it all: a thriving career, a nice home in Ottawa, two young kids…and a marriage coming apart at the seams. Then her husband, Matthew, vanishes without a trace during a family vacation up north. Sarah and her children are nearly lost among the slumbering lakes, treacherous cliffs, and brooding forests of the Canadian Shield. A glacier-scraped realm of ancient beauty and terror, it’s a world away from the safety of the suburbs. And a big storm is brewing.