Rilla's sister, Laurie, is dead, murdered on the moonlit rooftop above her apartment. There are no clues and no fingerprints. Yet there is a "witness". If Rilla can communicate with it, she can expose a murderer, but that communication could cost her her marriage, her sanity and her life.
Laurie's childhood affinity for plant life had developed into a remarkable telepathic bond, one that she had been researching exhaustively. When she is murdered, the only "witness" is her favourite houseplant. Rilla insists that the plant holds the key to the killer's identity. The police are openly skeptical of her theory. So Rilla becomes a one-person private detective agency.
Through the use of Kirlian photography, - a type of X-Ray process that can reveal the psychological aura of its subject - she compiles persuasive evidence. Still, her obsessive investigation is alienating her husband and upsetting her life. Her own telepathic communication with the plant is triggering a series of terrifying dreams of her sister's death and what she cannot distinguish in the prophetic nightmares is the face of the murderer who is about to kill again.[3]
Among the wilder branches of pseudoscience to gain popularity during the 1970's was Kirlian photography, which supposedly allowed researchers to document emotional reactions from plants during exposure to stimuli.[4] Kirlian photography is rumored to be the inspiration and basis for the film.
