Bad Blood is the fourth and final book in the Naturals series. The story follows Cassie Hobbes and her journey as a part of the FBI’s Naturals Program; an elite team of teenagers with unique abilities to help the FBI profile and solve cold cases. From the day Cassie joined the Naturals program she was always set out to solve her own mother's cold case. In Bad Blood Cassie and the team are even closer to solving the mystery of her mother’s cold case than they even know. Cassie and the team end up investigating in the town of Gaither, Oklahoma. The town is small, and brings back a flood of memories for Cassie, as she lived there with her mother as a child. Not only do these memories bring back crucial information for Cassie’s mom’s case but also ultimately help the FBI find the cult-like group who has been killing people for generations.
The book was a wonderful way to finish off this series. The book was full of plot-twists, mystery, great imagery, and intriguing details. The entire series never disappointed and especially this final book. The book had many surprising moments and adapted on mysteries and details in the other books. Something I really enjoyed is how Barnes had plot-twists relating to things in the other three books. I thought that played a nice role in ending the series but also kept me interested and surprised. The themes of friendship and the team dynamic that also play a role in this book make all the difference. Even in moments of great turmoil, when two of the characters had a disagreement, whatever it was, in the end the characters all come together and care for one another which is something I loved about the book. Another great part of this book is it touches more on their complex backstories of some of the characters like Micheal and Lia and introduces mysterious new characters like Mason Kyle or Holland Darby. Sometimes the details in the plot-twists can get confusing, but overall, an easy and fun book to read. If you are a person who loves thrilling mysteries, plot-twists, and a team dynamic the Naturals series is for you!