I emerge from the trees, drenched in sweat, my voice lost as I take in the scene in front of me. The blood. The body. Emma’s eyes meet mine for a second. “It was an accident,” she whispers.

Emma and I were childhood best friends. We did everything together. Until that terrible night in the woods.

I couldn’t tell anyone what I’d seen. We never discussed it, but our bond was too strong; I could never betray my best friend. Even if she had killed someone.

But I also couldn’t stay in town and watch her live a normal life, knowing what she’d done. So I left.

Now, ten years later, I’m back. The guilt and the fear have stayed with me. And I have realized I need to reveal the truth if I’m ever going to move on.

But I never get the chance. Because the day I turn up, Emma is found dead, and the way she died means I start to doubt everything I thought I knew about that night all those years ago.

As my grief turns to anger at all those lost years of friendship, I realise with horror that Emma might not have been the only killer. Someone else is out there. Someone who was close to us both, someone who knew the smallest details of what had happened back then. Who from our small town could have murdered not once, but twice? And who’s next…?