Slip and Sach are working as cleaners in a high rise building. They enter an office to clean it when a messenger hears them use Slip's given name, Terrance Mahoney. The messenger has a letter for "Terrance Mahonoey, Esq." and mistakenly delivers it to Slip. The letter informs Slip that he has inherited a mansion in Long Island. The boys then make their way to the mansion and find that it is inhabited by diamond smugglers. The real owner of the house shows up and helps save the day and defeat the smugglers and gives the boys the house as a reward.
Leo Gorcey
as Slip Mahoney
Huntz Hall
as Sach Jones
Gabriel Dell
as Gabe Moreno
Martin Kosleck
as Count Boris Petrov
Paul Harvey
as Terrence Mahoney
Amelita Ward
as Teresa Mahoney
William Benedict
as Whitey
David Gorcey
as Chuck
Jacqueline Dalya
as Sandra Hasso
Benny Bartlett
as Butch
Eddie Gribbon
as Digger
Hans Schumm
as Karl
