If you like a thriller with some genuinely brilliant bits, I recommend this! I have had it on audible which I think has possibly made some parts more disturbing because the actors doing the voice overs have communicated the emotions brilliantly.
This is a standalone book and not part of the Helena Grace series.
The premise of the story is what happens to children who kill when they grow up and are given new identities which are supposed to only be known to a very few people. I won't give anything else away!