"Brotherhood" is one of the best shows that no one is talking about. The Showtime show follows the exploits of the Caffee brothers, who work in a hardscrabble  working-class Irish neighborhood in Providence, R.I. Tommy, played by Jason Clarke, is an ambitious politico. Michael is a more than slightly damaged thug who’s struggling to gain a foothold among the local gangsters. Played by Jason Isaacs, Michael may be the most swoon-worthy psychopath on any screen.