Barney Miller

Dietrich and Wojo arrest a Native American when he attempts to retrieve the ancestral remains of deceased tribal members at a nearby museum. A scoutmaster assists the detectives in catching a mugger in the park. The twelfth precinct has to deal with another plumbing problem in the building and a language barrier between the officers and plumber tasked to fix the problem.

As Harris assists a robbery victim fill out his report, Barney and the detectives learn that the antique gun Wojo found originally belonged to former President Theodore Roosevelt when he was the New York Police Commissioner. As a result, the building gets designated as a historical landmark and will be sold to private investors.

When Barney and the detectives learn that the building has been sold and they'll have 30 days to vacate the building, Dietrich brings in a a pair of elderly women who tried robbing a neighborhood business. Luger tries to skip out on his mail-order bride. Later, the detectives and officers downstairs start airing their grievances about their upcoming reassignments.

On their last day at the twelfth precinct, Harris investigates a series of thefts involving manhole covers, while Wojo brings in a suspect accused of theft of his work at research facility he works at. When Barney receives everyone's transfer orders, they're stunned at learning they'll be split up at various precincts. Barney then is in for a surprise of his own regarding his promotion. Various friends and past suspects pay the detectives their last respects.