Each October, the Unsung Horrors podcast does a month of themed movies. This year they will once again be setting up a fundraiser to benefit Best Friends, which is working to save the lives of cats and dogs all across America, giving pets second chances and happy homes.

Today’s theme: Mexico

The Ghost of the Convent (released in the U.S. as The Phantom of the Convent) starts with sin: Cristina (Marta Roel), the wife of Eduardo (Carlos Villatoro), decides to try to lure Alfonso (Enrique del Campo) into her arms as they explore a forest together. However, a mysterious stranger guides them to an abandoned monastery.

Father Superior (Paco Martinez) reveals to them that one of the monks tried to seduce a friend’s wife once. Even in death, the monk couldn’t find peace and he remains today, a fact that Alfonos sees for himself. Imagine how he feels, ready to take his friend’s wife, and he sees the mummified monk, a book filled with blood and the body of Eduardo.

But is it all a dream? All three wake up at the holy place, which is now a tourist attraction.

Director Fernando de Fuentes was mainly known for his Revolution Trilogy — El prisionero trece, El compadre Mendoza and Vámonos con Pancho Villa — and was a pioneer in filmmaking. He also contributed to the script by Juan Bastillo Oro and Jorge Pezet.

The monastery says “When the soil harbors no impure desire, there is nothing to fear in the house of God.” Yet this trio is pulled in and may not be able to leave and they aren’t the only group of people pulled into this shadow world where ghostly monks repeat the same actions eternally and the sinful monk wails in his cell forever. This film also takes its time, yet it demand watching, as its spectral fingers are intertwined in so much of the horror that we love all these decades after.

You can watch this on YouTube.