An assassination attempt against Mayor Cleveland during the rededication of the Monarch Theater opens up a nest of corruption in Daniels' office; several officers catch the ""blue flu"" and head for Las Vegas with Belker, who wins $5000 on a free spin; Vera Horvath continues to hound Stan; and Hill and Renko try to settle a dispute involving a stolen lottery ticket.

Jablonski's female nemesis comes to the Hill for a final showdown; the vacationers are stranded in Las Vegas with Myrna Schnitz; Furillo has to persuade Biff Lowe to help incriminate the Berlettas; and the Cisco Kid returns as an Indian and takes Fay hostage.