On the eve of the premiere of a theatrical superproduction in the city of São Paulo, the assembly team performs the last dress rehearsal. But, mysteriously, the four leading actresses are poisoned. Now, the police will investigate each person related to the play to find out who caused the tragedy.
An wealthy Italian immigrant from São Paulo, watches closely the suitors of his daughter Fiametta, whose two previous husbands "suffered accidents" because they did not bear good children. She can only get pregnant of someone who, like her, bears the blood of the rare K factor.
Carlito, a bank clerk in Rio de Janeiro, is an engrained megalomaniac. Aided by his girlfriend Marta, he executes a wild plan that involves Milton de Souza, a married businessman, director of a factory.
Two factory workers decide to spend all of their pay on a Saturday night with two prostitutes, but things don't go as planned.
The police find the bodies of four bank robbers and the money from their last robbery burned. The fifth member of the gang, Toni, who was supposed to collect the money, tries to unravel the mystery. As Toni looks for the intellectual mentor of the assault, he remembers how you got into that situation.
