The Asphyx (1972)

Hugo, a renowned scientist from the early 1900s, enjoys a life filled with admiration from his family, friends, and peers. However, his fascination takes a dark turn as he becomes increasingly fixated on a chilling enigma: the eerie figure that appears in the photographs of his dying subjects. Driven by his quest for knowledge, he delves deeper into this unsettling phenomenon, which may lead him down a perilous path of discovery that blurs the lines between life and death. The boundaries of science and the supernatural begin to intertwine in his relentless pursuit.