It stars British actress Barbara Steele in the roles of Helen Rochefort and Mary, Italian actor George Ardisson as Kurt Humboldt, and Polish actress Halina Zalewska in a dual role as Adele Karnstein and her daughter Lisabeth.

Her beautiful older daughter Helen knows the real reason for the execution is Count Franz Humboldt's sexual desire for her mother.

In an atmosphere of cruelty, superstition, sexuality, and the plague's scourge, Mary begins to avenge Adele's death.

[2] Gastaldi told Tim Lucas that Valerii had attempted to start his career as a director with the film, but that the producer had Antonio Margheriti chosen.

[3] Produced by Felice Testa Gay's company Cinegai S.p.A., I lunghi capelli della morte was released in Italy on December 30, 1964, through the distributor U.N.I.D.I.S.