This logline has a lot of different elements, but because it isn't clear how these elements relate, the logline is a bit confusing.
First, "When his brother is shot dead during a botched bank robbery," It isn't clear if his brother was the one robbing the bank or if he was a victim during a robbery.
"To re-claim their family inheritance" I am not sure what this has to do with a bank robbery or his brothers death.
"a disenchanted book keeper must face.... his fear of public speaking" again this seems to come out of nowhere. It is unclear how fear of public speaking relates to the bank robbery or the family inheritance.
So I like that you have a bunch of different elements but you may want to be more clear as to how it all relates.
Hope that helps, good luck with this.