Rio de Janeiro police investigator Galvão is pursuing two trails, one professional and one personal. While he tracts a serial killer of taxi-drivers, he also seeks his estranged daughter, Sandra, who he had thrown out of the family home when she adopted a promiscuous teenage lifestyle. Lives intersect when the serial killer, Toninho, a young man of unsavoury connections, befriends Sandra, now an exotic dancer and prostitute living and working in the seamy underside of late 1970s Rio.