Rain pounds the windscreen in the pitch-black evening. She knows this winding country road like the back of her hand, dodges the potholes with ease. But then she hears a crunch. A thud.

Since Katie’s dad left, it’s just been the two of us, but we’re a team – singing in the kitchen at cheesy pop songs, tackling her homework. My teenage daughter is everything to me.

But one night, as we’re curled up in front of the TV, the messages start. I keep my phone away from Katie so she can’t see the terrifying words: I know what you did. Now you’re going to do something for me....

My gut wrenches. In the town we’ve lived in our whole lives, could someone know about the terrible thing I did to protect my girl and keep her darkest secret?

Desperate to discover who is sending the messages, I have no choice but to obey. As I drive where they tell me, do what they say, send the photo evidence they want, I’m sure someone is watching me, too…and when one of our windows is smashed in the middle of the night, I suddenly realise who must be behind it all.

Someone I used to trust.

Someone right here in this safe little town.

And now I’m more scared than ever.

I’ve already done something terrible to protect my daughter. How much further will I have to go?

An absolutely addictive thriller about how far a mother would go for her child, with a twist that will leave you gasping.