María Nicolasa decides to dedicate her life to the faith and enter a convent as a novice. However, her impulsive nature, unmistakable naivety, and unconventional methods immediately disrupt the nuns' rigid routine. Upon learning of the serious financial troubles threatening the local orphanage, the amusing novice does not hesitate to get involved in all sorts of zany situations, confronting thieves, loan sharks, and authorities alike to protect the orphans and keep her order's mission afloat.

María Elena Velasco
as Sor María Nicolasa

Pancho Córdova
as Comisario

Martha Roth
as Madre superiora

Ahui Camacho
as El Greñas

Rebeca Silva
as Sor Esperanza

Pedro de Urdimalas
as El Greñudo, papá de El Greñas

Lupita Pallás
as Sor

Elsa Linares
as

Tomas I. Jaime
as

Yula Pozo
as Sor