Fitting tight and snug leading directly into Episode IV:A New Hope,Rogue One tells the story of, first, how the rebels (many of who lost their lives) were able to acquire the plans of the Death Star. But, it also answers a key question as to why they sought to go after it AND why that pesky weakness was there in the first place.
It's a slightly darker tone than those first episodes from 1977 ff, but necessarily so. The mood…