The new thriller from Mark Billingham, author of the Tom Thorne and D.S. Miller series, full of tension, wit and incredible twists.
You'll never know my real name. You'll never know what I've done. ​

I'm a former undercover police officer. 'Former', because we don't get to retire, not really. Even after the case is done, we keep living the lie.​

After years on the job, I've finally managed to find some anonymity. A tedious job, a normal life. But then a young man arrives at my workplace, whispers "I know who you are" and sets himself on fire.

That's when everything changes.​

Who is this stranger? Who put him up to this? How do they know my secret?​

Only one thing is clear: there's no hiding anymore. Do I run, as I have done so many times before, or do I face the sins of my past and go back undercover?​

What if my darkest secret is the one I didn't know I had?