Norfleet Mansion is seriously plagued with leaky pipes, and so the butler summons Day and Nite Plumbers. Moe, Larry and Shemp reroute the plumbing and recover a painting stolen by a pair of crooks.
The stooges are the "Day and Night" plumbers. Called out to a fancy mansion where a society party is going on, they cross the electrical and water systems and generally ruin the place. Despite their incompetent plumbing, they save the day by recovering a painting stolen by a pair of thieves masquerading as party guests.