When a disgruntled Navy marine biologist takes his own life, few people in the picturesque Montana town of Whitefish understand what he has left behind. But when a lifeguard is found dead in the frozen lake with unmistakable signs of trauma, it becomes clear that something engineered, highly adaptive, and never meant to escape is hunting beneath the surface. Its creator took the answers with him—and a local tragedy could soon become a global biological disaster