In this unsettling horror short, a lone investigator plunges into a realm of darkness where every shadow hides a secret. Directed by Suwirot khongyuen, who also stars as the nameless protagonist, the film follows a detective consumed by a chilling case that defies rational explanation. Haunted by fragmented memories and a persistent sense of dread, he navigates a labyrinth of eerie corridors and abandoned spaces, each step pulling him deeper into a surreal nightmare. The sparse, three-minute runtime is packed with atmospheric tension, relying on stark visuals and an oppressive soundscape to build a suffocating sense of paranoia. As the investigator pieces together clues that seem to point toward his own fractured psyche, the line between reality and hallucination blurs. Suwirot khongyuen delivers a quietly intense performance, capturing a man on the verge of unraveling. Sombre Investigation is a stark, minimalist horror experience that questions the reliability of memory and the true nature of the darkness we carry within.