EXCLUSIVE: HBO‘s Boardwalk Empire continues to beef up its cast for Season 4. Patricia Arquette has joined the period mob drama in a major recurring role opposite star Steve Buscemi. She will play Sally Wheet, a tough-as-nails Tampa speakeasy owner with connections to local gangsters. Season 4 is currently in production for a debut later this year. Its cast additions also include new regulars Ron Livingston and Jeffrey Wright and recurring Brian Geraghty and Eric Ladin. This marks Arquette’s first major series commitment since her seven-season starring turn on NBC/CBS’ Medium. She is with Gersh, 3 Arts and Ziffren Brittenham.