(speculative recap) SPOILERS
Wynonna Earp (Melanie Scrofano) has recovered Peacemaker, which has gone back to being a gun. (At the end of Season Three, Bulshar ended the Earp curse causing most revenants to vanish and transforming Wyatt’s Buntline Special into its original form, an extra-flamey sword.) Bulshar enacted the curse in 1887, the year of Doc Holliday’s actual death (Episode 3.10), and Wyatt was given the gun at least six years earlier, so it’s a mystery how Robert Svane (later known as Bobo Del Ray) managed to switch the transformed sword with the gun Earp always carried, and one wonders exactly what happened to the original.)
Waverly (Dominique Provost-Chalkley) and former Sheriff Nicole Haught (Kat Barrell) are now engaged to be married. Waverly has gained the ability to kill by grasping someone’s skull firmly in both hands, a talent that might be somehow related to her being bound to the skull of the Stone Witch‘s son in Episode 1.6. Waverly kills Ma Clanton (Paula Boudreau) in that way to end the curse on Nicole. She then immediately says: “What did I do?” as though it might have been an involuntary action. It is true that Waverly killed Bobo Del Ray in the same way at the end of Season Three, but at that time she was wearing her father’s ring which enabled her to do things like resurrect dead people. She left that ring behind in The Garden. On Reddit, (u/Photograph-According suggests some other possible connections between Waverly and Constance Clootie.)
After being bitten by tiny crab demons at the beginning of Season Four, former Sheriff Randy Nedley (Greg Lawson) was left in the care of Mercedes (Dani Kind) who is now a stripper at a club called The Glory Hole, which is run by a demon named Amon (Noam Jenkins). Nedley then turned into a Sasquatch-like creature, but has subsequently recovered. Rosita (Tamara Duarte) did not vanish with the rest of the revenants when the curse ended because she was protected by a circle of ammolite (the same stuff that protects the Earp Homestead). Rosita now resides in a similarly protected nunnery. Rachel (Martina Ortiz-Luis) was taken into custody by Purgatory Sheriff Clayborn (Ty Olsson) for attempting (unsuccessfully) to burn down the Earp Homestead, but was later released.
With no curse to be heir to, Wynonna is once again working for Black Badge Division, which has somehow lost nearly all records of what has gone before, and is being run (at least locally) by Deputy Assistant Director Naomi Hycha (Reagan Pasternak), who has also brought Jeremy (Varun Saranga) back into the BBD fold. As she searches for Peacemaker, Wynonna finds out two things (or thinks she does). Rosita tells her that it was Ma Clanton who was after baby Alice, and she learns from an old film that (according to Wyatt) Doc shot first at the OK Corral. This somehow results in Wynonna using her newly recovered firearm (which despite the end of the curse is still able to kill demons although they are no longer sucked underground in flames) to shoot Sheriff Clayborn in the back after Doc had just finished making a deal with him to end the Clanton/Earp feud. All this makes one ask: Is Wynonna’s gun really still Peacemaker?