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.