The wealthy Sergio de Barrios is poisoned at the Ambassador cabaret while conspiring with a dancer named Lily del Valle. Police officer López is tasked with tracking Barrios's house and finding clues to the crime. He uncovers a drug trafficking network headed by the cabaret owner. A series of murders ensues, aimed at preventing the motive for the millionaire's murder from being revealed. A journalist begins investigating the case, which leads him to the dancer Lily del Valle, with whom he falls in love.