Wynonna has a run in with Revenants that leads her to an unexpected revelation about the curse. Waverly meets an important figure from her past, and Nicole tries to evacuate Purgatory - before it's too late.

The Pledge Moon looms over Purgatory as Wynonna and Waverly must find a way to end the family curse before their demonic foe puts an end to the Earp line - and humanity - once and for all.