"The Sinful Nuns of St. Valentine" takes place during the Spanish Inquisition. Esteban (Paolo Marco) is falsely accused of heresy by the father of his girlfriend Lucita (Francoise Prevost) and is wounded while eluding capture. Esteban takes refuge in the convent where Lucita has been banished by her father and is hidden by Joaquin, a servant. Joaquin brings Lucita to Esteban and she tends to his wounds, but when Lucita's cellmate Josefa (Bruna Beani) is later found stabbed to death, the abbess (Jenny Tamburi) accuses Lucita of the murder.
Though this exploitative film is decently acted, it is mired in melodrama and sometimes unintentionally laughable in its cinematically bizarre evocation of the Inquisition, complete with erotic goings on, torture, and demonic characters.
In Italian with English subtitles, the Blu-ray release contains trailers of other releases in the label's Redemption series.