Tier One is a top-notch action thriller with a strong emotional attachment. I was highly impressed with the characters, the action sequences, and the espionage laden story that unraveled throughout the book. The characters, especially the members of Tier One unit Dempsey comes to join in the book, are written as real life multi-dimensional characters as opposed to being treated as mere tools to advance the story. Jack Dempsey is already one of my all time favorite bad-asses, ranking up there with the best of the best in the genre such as Mitch Rapp, Scot Harvath, Logan West, Pike Logan, James Reece, and many more. Dempsey’s journey from a door kicking Teams guy to an operative working in the shadows with more brain than brawl was entertaining and enlightening to read. The bond that forms between the team instantly attracted me to the team itself, investing me emotionally into the team banter and some highly emotional moments. The action sequences were fantastic, written with sharp and accurate descriptions of weapon systems and tactical operational procedures, just the way I enjoy them. The villains are written in such a way that it makes the reader much more excited to see them go down viciously at the hands of Jack Dempsey and his Tier One unit. The witty team banter felt very natural to read between some serious heart pounding moments. The twists and turns did not stop till the very last page and the ending itself was a clear indication of the many more sequels that have already been published. I thoroughly enjoyed Tier One and I am officially a fan of the authors. Looking forward to reading the next books very soon. All in all, Tier One is a novel not to be missed by action thriller fans.