3.5 - 4 stars 
 If you have a fear of blood or its details, this book might not be for you. I find it a bit hard rating this book as well. There were good and bad aspects which I will explain in my review. 
 Cain Killion, also known as Killer Killion's Kid, aka Triple K, has been living in the shadows of his father's sins. He was forced to endure his father's torture as a child, and through that torture, he developed a sensory ability to get into a killer's mind by touching and bathing in the blood of the victims and replaying the moments before their deaths. Now he uses that ability to help the FBI solve murder cases. 
 Very interesting premise for a book, right? Though you have to suspend some disbelief to get through the book. 
 It is almost twenty years since the Ledgers family was murdered by Adam Killion, leaving the only victim, Mercy Ledger and a symbol drawn on the wall as evidence. Now on a current murder case, that same symbol has surfaced and Cain must decipher what it means and what connections it has to his father's crimes. 
 Mercy Ledger is trying to survive, as much as you could survive in a mental institution where the psychiatrist who's supposed to be helping you is also a sociopath. Cain needs to know what Mercy knows from that crime years ago, so they must somehow work to figure this out. Not easy to do when you have a target on your back. 
 There's a romance that develops between Cain and Mercy but what ruined the enjoyment for me was their self-deprecating thoughts of themselves and how they'd be better off leaving the other person alone. It was frustrating in that as soon as something happens to the other person, they realize they can't live without them. Mind you, both these characters have been through the ringer in the "mindfuck" category of twisty proportion. 
 There is an unexpected twist in the book that left some questions unanswered, which I assume will be addressed in the next book. Although there were some issues in the book, such as the unexplained reason how Adam Killion was caught in the first place, what drove him to kill, his motives, etc. I find it hard to believe that after 70-something murders, he would be caught so easily. It would be nice if this information was filled in. There were parts where the story and its directions were predictable so I wasn't surprised when they were revealed. The author's writing is good, albeit the prose is flowery at times considering the context of blood and gore. It was still an interesting read for a psychological thriller but the loose ends and the pacing, which dropped halfway through, made me round the ratings down to 4 stars instead 5. 
 Thank you Sourcebooks Casablanca and NetGalley for this ARC in exchange for an honest review.