The rhythm is the trap. The mind is the cage.

Officer Regina Oliver is a rookie with a photographic eye and a desperate need to prove she belongs in the male-dominated world of the Precinct 4. While the veteran detectives dismiss a string of high-society suicides as "city stress," Regina spots a chilling signature: every victim moved with the same mechanical, four-step cadence before they died.

Her obsession leads her to the doorstep of Dr. Thorne Jiller—the "Sandman"—a charismatic psychiatrist who doesn't just treat his female patients; he rewrites them. Using a lethal combination of rhythmic audio cues and sensory triggers, Jiller turns successful women into his mindless "toys" before programming their final, lethal walk.

Determined to catch him, Regina goes undercover as a patient, unaware that she is walking into a web designed specifically for her. When Jiller discovers her badge, he decides to make the ultimate example of the law, subjecting Regina to a deep-level "reset" that turns her against her only ally, Detective Stalone Holme.

In a final, pulse-pounding stand-off at a rhythmic clockwork factory, Regina must fight a war on two fronts: the physical battle against a desperate killer, and the psychological battle to reclaim her soul from the Gemini Hypnosis Protocol.

One, two, three, four... the walk begins. Can she break the beat before it breaks her?