I enjoyed this author's previous book, The Watcher, as it was a little bit different from the norm, so I was very interested in seeing what he would serve up next. From The Watcher, I knew that I was probably in for an interesting ride as I spent the majority of that book a wee bit on the confused side but, he came through for me in the end in that book so I was able to trust that he'd probably do likewise here. I am glad I had this foresight for this book as, to be honest, it was also a bit unique!So, Tom Mondrian is a Police Community Support Officer in London. He has only just finished his training and has been on the job barely a week before he is shot in the head. Instead of killing him outright, the bullet fragments and lodges in various parts of his brain causing damage to areas responsible for certain personality traits. The two most obvious and indeed important ones being that he now can't recognise faces, nor does he have that filter between brain and mouth. Basically bypassing the "What you think and what you say" filter. He has other quirks too but I will leave you to discover them in your own time.He is shocked and surprised when, instead of being cut from the force, pensioned off in the line of duty, his employment is continued. Something about disability quota and good publicity, being some of the reasons bandied about.He is partnered with fellow PCSO Emre Bartu and the two of them are sent to do the mundane work usually carried out by those in their position. On one such call, they dip their toes into the ongoing investigation of missing schoolgirls. Tom's interested is piqued and he uses his new found skills, born from his condition, to inveigle himself into the case; off the books of course, with Emre a reluctant but mostly willing participant.One of the things that made this book for me was the wonderful character of Tom Mondrian. In him, the author has created someone really rather special. Not just with his new skillset as there were glimpses to be found before the accident. I am not sure exactly what it is about him but I took to him from the off. Post-accident, with all his quirks established, he just blossomed into someone really quite unique. Told from his own perspective, it is at times challenging to follow but, as already mentioned, I have been here with this author before so I knew to stick with it. It's refreshingly good to be challenged as a reader, there's not too much of this about these days. We also go around the houses a fair bit to get to where we end up but again, this is within keeping of his condition. He's the one telling the story so we have to follow it from his perspective.I am not sure exactly how plausible / credible the story really is but, to be honest, I like Mondrian enough to really rather not care too much about this nitpicky stuff. It's a wild ride and one I am glad I took, holding on tight of course! Best thing is, it's a series opener which means that I get to do it all again in the future. I'm ready when you are!My thanks go to the Publisher and Netgalley for the chance to read this book.