Ten years ago, deeply in love, I would have done anything for Thomas Kirkwood. But on the night of our graduation, fuelled by drink and drugs, Thomas’s lifeless body was found floating in the Kirkwood family lake. That weekend changed everything, and I swore I would never return to Kirkwood manor. Now, ten years later, I have been invited back to the place that holds such terrible memories for me, to a memorial weekend for Thomas, organised by his still-grieving mother Ada. But this is no ordinary weekend. This is a reunion to catch a killer.

When I first walked into Jake and Megan’s immaculate home, I felt totally at ease. Sitting in the crisp white living room, they held hands and talked lovingly about their baby girl, Fern. As the weeks passed, I began to think I’d made a mistake in taking the job. Jake was overly friendly from the start, watching my every move and always offering to drop me home, even though it was out of his way. And Megan seemed to take pleasure in telling me off in front of her husband, blaming me for things I hadn’t done.

Sisters Molly and Beth Winters thought the remote clifftop house would be the perfect place to hide away after their mother’s brutal murder. They were wrong. Because someone from the girls’ past has already found their safe house and he is watching and waiting in the shadows ready to make them pay. Their new home should have been the place the sisters were safe. But no place is safe forever.

I open the creaking oak front door of my beautiful country house to see a stranger on my doorstep. The woman is stunning with glossy red hair and flawless make up. "Can I help you?" I ask. That was my first mistake. Alexis tells me she is a distant relative and shows me a DNA match on her phone. She has no family and would love to get to know us. My husband Hugh invites her in to join our dinner party. As we drink wine, she opens up about her sad childhood. Her amber eyes are mesmerizing, and I can see my husband is being drawn in by her story. Then she asks for our help.

Moving to Prospect Close has been everything I’d hoped for. In the city, Oliver and I barely saw each other, irritable at home and rushing around after the kids. But here, the neighbors have been so friendly and welcoming, and we’re now at barbeques and playdates every weekend, all together, as a family. It’s the type of life I always dreamed of. One that’s a million miles from...before. Not that Oliver would know anything about that.