4.5 stars 
 In the final installment of the Killer Instincts series, readers get two stories wrapped up in one. Cate & Ash and Liam & Sully all have stories readers have looking forward to for a long time. Part of me loves that both couples work towards their future at the same time, but the other part of me wishes each could have had the spotlight to themselves. The way these two couples' stories weave together makes them natural to tell within one overall plotline. 
 Now that Cate is no longer under the thumb of her grandfather and building a relationship with her father, she is itching to feel like she has some control over her choices, which also means she is constantly battling with Jim about what her future will look like. Ash has stayed away, despite the close friendship that developed between them simply because of the age difference and in deference to Jim's threats. But Cate is tired of being treated like a child by both her father and Ash, and she is determined to make her own choices. 
 Liam and Sully have avoided Jim's team and each other for some time now. Only the emergency that pulls everyone in brings them back, and everyone knows they will each go their own ways when they are no longer needed again. But their friendship will never be the same, and even though time has passed, they haven't dealt with the emotions that sent them each running. 
 I was really waiting for Liam and Sully's story and while I loved their ending, getting there often felt like it took a backseat to Cate and Ash's story and the danger they were facing with the cartel. 
 The op that this book focuses on was not a planned op, and the danger is ramped up because the guys can't plan contingency upon contingency as they normally would. Cate isn't prepared for the information she finds, nor is she prepared for the information to put her life and the lives of everyone around her in danger. Facing a situation Jim's men had never faced before, everyone spends much of this book in a state of disorder and unbalance unlike any other op they've ever faced. 
 This was a fast paced read full of danger. There was great movement and action through the multiple story arcs that played out simultaneously. For as long as this book is (for two full couples) it didn't read as if it were longer than a typical novel. The pages turned easily and quickly as I was pulled right alongside Cate and the rest of the characters as they worked to contain the danger to Cate. 
 I was gifted a copy in exchange for an honest review.