A brilliant but reclusive software engineer discovers a mysterious "glitch" in his home security system that captures footsteps—or "tapak"—of someone who isnt there. As the rhythmic sounds grow more frequent and aggressive, he realizes they are counting down to a specific date. To stop the countdown, he must solve a cold case involving the previous occupants of his apartment. The film is a high-concept psychological thriller that explores the thin line between technology and the supernatural.