Angels and Demons (1969)

Original title: Anjos e Demônios

Don't wish to meet a sweet girl like Virginia.

Virgínia is an orphan teenager who lives with her rich uncle Marcos, whom she drugs with barbiturates to promote parties in the apartment for her friends. At these parties, which are attended by minors and are fueled by drugs and alcohol, she gets involved with the scammer and ruffian Paulo, a teenager who lives in the North Zone of Rio de Janeiro. She and Paulo end up in the police after sexually abusing other minors, but her uncle's lawyer, Henrique, manages to save them from being prosecuted. Pretending gratitude, Virginia approaches Henrique and, when her uncle takes her out of town, to get away from "bad company", she tells Henrique her plan: murder her uncle to keep his fortune. Henrique gets involved by the girl, not knowing that she, in fact, intends to blackmail him.