Hard Pressed

A profligate heir returns from South Africa where, instead of making his fortune in the diamond fields, he did so badly he returned to the old, closed up manor house (the estate having been sold off long before) to pick up a few things he'd overlooked when he left so abruptly. His ex-girlfriend's father is indebted to the scoundrel who ruined the hero's chances in S.A. to the point where he's willing to marry his daughter off to him if that will save the estate next door. Neither the bad guy nor his henchman are S.A. millionaires, but they are impersonating them so as to live well on credit until their fiendish horse-racing swindle matures, at which time they will indeed be rich.