Warning: Full spoilers for the fourth season of Boardwalk Empire follow…
While the third season of Boardwalk Empire seemed to be about the tearing down of Nucky's world (thanks in no small part to Emmy-winner Bobby Cannavale's ferocious Gyp Rosetti), the beginning of Season 4 was all about repairing it. Nucky formed an uneasy-but-satisfactory truce with Masseria and new bootlegging prospects opened up in Florida, growing the booze business like never before. But what Nucky didn't count on was everyone around him crumbling.
Most notably, and noticeably, Jimmy's story still had too much pain to contain. It was a wound that hadn't quite closed yet. And the remnants of the Darmody arc were still engaged in a tug-of-war - one that would eventually turn that world to ash. A sad fact, and one that took two years after Jimmy's death to fully deal with. Even sadder for the viewers too because even though we felt the loss of Jimmy (whether you loved him as a character of simply thought, as the show's "Number Two," he was vastly more interesting than Nucky) we still had Gillian and Harrow to cling to. Gillian wasn't always an easy woman to love, but you always understood why she did what she did, or at least why her traumatic past forever warped her sense of family and propriety.
via IGN All http://feeds.ign.com/~r/ign/all/~3/zHtWuxxngp4/boardwalk-empire-season-4-review