The Central Warmth(1978)

A tenement house needs to have steam heating installed. The residents find the necessary workers to do it, sign the contract and pay them in advance. The workers show up and start their job, but disappear immediately. Panic-stricken, the residents set up to search for them, only to find the workers in jail. Totally desperate, their only chance is to come up with an ingenious plan how to bring the work to the end.