Boardwalk Empire returns to HBO on September 25. What can viewers expect from the series many considered to be among the best of 2010?

The network has released the following, official synopsis for the episode titled "21."

Nucky is rocked by an insurrection among his inner circle; Chalky's life and livelihood are threatened by a vicious KKK attack; Margaret copes with her son's disciplinary problems; Angela vies with Gillian for Jimmy's affections at home; Van Alden shows his wife Rose around town as an anniversary present.

Meanwhile, for those who really like to plan ahead: The season two finale airs on December 11.