Like his contemporary James Mason who came up roughly the same time as he did, Stewart Granger seemed to be born to play in these romance novel roles. In Blanche Fury he's got a nasty grudge against the Fury family who have kept him working as a groom on their estate. He's one of them, but born on the wrong side of the blanket as they said in those days.
There's a dual focus in this film and it's on Valerie Hobson playing the title role as well. She's also knocked about a bit kind of like George Eastman in An American Tragedy, she's one of them, but only distantly. Still she's on the right side of the blanket and she determines to marry Michael Gough the heir to the estate for a life of ease and comfort.
Granger like the real life James Scott the Duke of Monmouth searched for a connection to his father King Charles II to prove he was heir to the throne. Didn't happen for him and didn't happen for Granger But what does happen is that he gets Hobson's mojo going far more than the insipid and privileged Gough does.
These are the ingredients of Blanche Fury and if you like these movies and read these novels you can pretty much guess what happens. Hobson and Granger are a stirring romantic pair, but Granger in his desire to improve his station goes quite a bit off kilter. Hobson has a choice to make and she makes it.
As for who gets the Fury estate. For that you have to see Blanche Fury.