THE LEECH WOMAN

A mysterious old woman named Malla, who claims to have been brought to America 140 years ago as a slave, approaches endocrinologist Dr. Paul Talbot and promises to reveal to him the secret of eternal youth if he will fund her final trip back to Africa, so that she can be beautiful and young for one last night before she dies.

Paul is unhappily married to the alcoholic June, who is 10 years his elder. They follow Malla to Africa and witness a secret ceremony of the Nando tribe that utilizes orchid pollen and a sacrificial male's pineal gland secretions. The secretions, extracted from the back of the neck via a special ring and mixed with the pollen, temporarily transform Malla into a young, beautiful woman.

After discovering that her conniving husband only brought her along as "a guinea pig who could talk," June takes revenge, choosing Paul to be sacrificed so that she can use his pineal gland extract to become young again herself, though Malla warns her that the transformation will not last long. With the help of her jungle guide Bertram—who unbeknownst to her has stolen the ring and a substantial amount of pollen—she escapes into the jungle, using explosives as cover. The next morning, she finds she is old again, and kills Bertram for his pineal secretions.

June makes her way back to America. Masquerading as her own niece Terry Hart, she keeps herself young by picking up men and killing them for their pineal extract. But each time the potion wears off, she is older than she was before. As Terry, June becomes enamored of her lawyer Neil Foster, a man half her actual age. She kills his jealous fiancée Sally Howards, draining her pineal gland, thereby eliminating the woman as competition.

When the police come to investigate the murders that June has committed, she uses Sally's pineal gland extract but finds that, because it is from a woman, it actually has the reverse effect. Before the police can arrest her, she throws herself out her bedroom window, crashes to the ground, and dies. When they see her body, it is much older than ever before.

June, disguised as her own niece, becomes increasingly desperate for youth, ultimately killing for pineal extract. When her final attempt fails, she leaps from a window and dies, her body grotesquely aged.

The film closes on the ultimate price of chasing eternal youth through unnatural means: each transformation leaves June older and more desperate, until her final act of self-destruction. The ending underscores the inevitable consequences of obsession and the moral decay behind the scientific and mystical quest for beauty, leaving viewers with a cautionary tale about the dangers of tampering with nature.