This first book in FBI-K9 series by Jodi Burnett was definitely a dark and very intense suspense-filled thriller as the FBI attempts to track down a serial killer before he can take down one of their own. It is also multiple episodes of simmering love interests as the couples attempt to come to grips with their feelings towards each other. The story definitely holds the readers' attention as it swiftly moves along to its pulse-pounding conclusion. I will definitely add other books in this series to my TBR. This is a voluntary review of an Advanced Reader Copy of this book from Hidden Gems Books.