Alex Miles is running for his life. A brilliant scientist, Alex sabotages his own groundbreaking work when he discovers its potential for criminal exploitation. Now, hunted by ruthless mercenaries hired by the very people who employed him, Alex is desperate to stay one step ahead. During his escape, he crosses paths with Detective Billie McCoy—a tough, street-smart investigator who becomes an unlikely ally after Alex saves her life. Grateful and intrigued, Billie agrees to his one request: find his daughter, Sophie, and warn her before the same people come after her too. But what begins as a simple message delivery spirals into a dangerous mission. Sophie has vanished into the ranks of an elusive underground militia known as Shadax—an off-the-grid army hidden deep in the mountains, where entry is strictly by invitation. To reach Sophie, Billie must go undercover as a rookie recruit. But once inside, she discovers Sophie isn't the helpless daughter she expected. Cold, commanding, and fiercely loyal to the cause, Sophie has no interest in the outside world—or the message Billie came to deliver. Now, with the mission unravelling fast, Billie must navigate a camp filled with secrets, suspicion, and a powerful force she doesn't fully understand.