They all share the same secret: none of them are who they say they are.

They are among only nine criminals in the UK who have been granted lifelong anonymity, for their own safety, because of their terrible crimes.

But what if someone exposed their true identities to the families of their victims, who are desperate for revenge?

Probation officer Olivia Campbell is caught in the crossfire of this unprecedented crisis - and as the hunt for the mole behind it all intensifies, so too does the search for the vigilante killers let loose by the leaks...

Everyone is a suspect. Anyone could be a killer. Who deserves justice? And who gets to decide?