Psychological horror has always relied on atmosphere, suggestion, and the quiet feeling that something is deeply wrong beneath the surface of everyday life. Undertone (2025) fully embraces that philosophy. Rather than overwhelming the viewer with constant jump scares or graphic violence, the film slowly burrows into the mind, building tension through sound, silence, and a lingering sense of unease. The result is a horror experience that feels intimate, unsettling, and surprisingly thoughtful. From the opening minutes, Undertone makes it clear that it is not interested in rushing its story. The film begins with an almost hypnotic pace, introducing us to…