Fallon inadvertently collides with Culhane's secret life; Alexis tries drive a wedge between Blake and Cristal.

Fallon recruits her mother's help with wedding planning, only to realize that Alexis may have ulterior motives; Culhane discovers his dark side as he ventures into a new business partnership.

As the Carringtons track down a dangerous enemy on Christmas Eve, Fallon and Blake clash on how to best handle the situation, stirring up unresolved grievances. Meanwhile, Cristal suspects Alexis may not be telling the whole truth to the authorities, and Kirby is cast out by Anders for having an immature reaction to the grave situation at hand.