Figueiredo (Giulio Lopes) is a wealthy businessman bored with his routine and predictable life. After attending a play, he becomes fixated on the concept of committing the "perfect crime" pure for the thrill. Shortly thereafter, his wife, Emma (Dedina Bernardelli), and his business partner, Ancelmo, are found dead. The plot follows the investigation as the detective unravels whether Figueiredo orchestrated the murders himself or if an underlying betrayal took place.