The genre’s roots can be traced to 1940s film noir and early psychological dramas, where mood and character psychology outpaced special effects. These pioneers planted the seeds of suspense and moral ambiguity that would later bloom into full‑blown thrillers.
Over the decades, filmmakers have refined these seeds, introducing new narrative devices and visual styles. The result is a rich tapestry of themes—identity, paranoia, and the blurred line between reality and illusion—that continue to captivate viewers today.