For five years, Roman Hoflinger and Curt Prank have been rival partners in the brewery, and Clara's share of the deal is the deciding factor in every business decision. Torn between her father and her husband, she hopes for a fresh start in America with Roman, as their marriage is at stake. Prank, over Roman's head, puts everything on the line with a gigantic innovation for the 1905 Oktoberfest! But a new rival sees his opportunity to take advantage of the dispute.

Prank has freed his sworn enemy Maria from a psychiatric hospital and lifted her incapacitation in order to stop Roman's merger with Capital Bräu. But she surprisingly supports her son. With no alternative, Prank blackmails his daughter in an attempt to stop the merger. Clara frees herself and confesses the affair and the blackmail to Roman! Deeply hurt and manipulated by Maria, Roman challenges Prank to a duel! After the destruction of the "Oak Tree," Nappi and Colina search for a way to raise money.