That somebody gets rid of Braden.

Why?
So that the secret'll be known then only to one--the murderer! See! And why?
Why ?" "Well, why ?" repeated Bryce.

"Don't see, so far." "You must be dense, then," said Sackville with the lofty superiority of youth.

"Because of the reward, of course! Don't you know that there's been a standing offer--never withdrawn!--of five thousand pounds for news of those jewels ?" "No, I didn't," answered Bryce.
"Fact, sir--pure fact," continued Sackville.

"Now, five thousand, divided in two, is two thousand five hundred each.