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A weapon he never built. A war he never wanted. A woman he won't lose. Dr. Darwin Oswald designed his science to keep wounded soldiers alive long enough to reach a surgeon. Oliver Finch, his partner and friend, built an empire on the bodies it left behind. Now Darwin is a fugitive. His name is a headline. And the man who betrayed him is still ten steps ahead. Combat medic Wynn Whitmore has been legally dead for three months. Family she can't call. A life she can't return to. A war with no name—and one stubborn, infuriatingly brilliant reason to keep fighting it. What started as mutual respect has been heating up for months, and now Darwin is more than the man behind the mission. He's the reason she won't give up. When Darwin's last ally is murdered and the charges against him multiply, Black Hollow stops hiding. The path to Finch is narrow and lined with a choice Darwin can't stomach. To take Finch down, Darwin will need to weaponize his own team. He'll have to trust the science he built. Trust the team putting their lives in his hands. And trust that the woman he's falling for makes it back to him in one piece—so he can administer the final dose. Or it will all be for nothing. Four books. One war. This is how it ends.