A child is witness to an assault on a monk by the gang of Lorenzo the Fifth. The monk escapes and takes refuge in the estate of Doña Carlota, a countess who lives with her son Juan and daughter Beatriz. Basilisa, the maid, conjures the devil to free her son from an irreversible illness, but to do so the evil must be transmitted to an innocent soul, and for that she chooses Beatriz. The child begins to be the victim of a possession, for which everyone blames the monk.
Carmen Sevilla
as Doña Carlota
Nadiuska
as Basilisa
Jorge Rivero
as Fray Ángel
José Sacristán
as Máximo Bretal
Sandra Mozarowsky
as Beatriz
Elsa Zabala
as Saludadora
José Lifante
as Rata
Óscar Martín
as Juan
Eduardo Bea
as Tres Dedos
Pedro Luis Lavilla
as Gondarín
Juan Antonio Peral
as Pelos
José Luis Velasco
as Cepillo
