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Better Call Saul's fourth season ended with "Winner," an exciting finale that inches the spinoff closer to its Breaking Bad roots. This year, AMC's acclaimed drama had to followup the jaw-dropping cliffhanger of season 3, where Chuck died in a horrifying fire. That tragedy is what truly spurred Jimmy McGill's transformation into Saul Goodman as he dealt with the consequences and aftermath of not only his brother's death, but also his bar suspension. Over the course of the fourth season, Jimmy became more involved with the criminal underworld of Albuquerque, launching his "get-rich-quick" scheme of selling prepaid cell phones to unsavory individuals.
Elsewhere in the Saul universe, Gus Fring looked to expand his cartel operations, commissioning the construction of the famous "super lab" Walter White and Jesse Pinkman cooked in during Breaking Bad. Entrusting Mike Ehrmantraut to oversee the operation, Gus hired a group of Russian nationals led by Werner Ziegler. While the project was taking longer than originally planned, the crew was working diligently and hoped to have it finished soon. Of course, things hit a snag at the end of last week's "Wiedersehen" when Werner went AWOL, leaving only a note with detailed instructions for his team. These storylines (Werner's disappearance and Jimmy's bar reinstatement appeal) are the crux of the finale's narrative, with both resolving in powerful ways.
Throughout the season, Werner's team were recurring players, frequently interacting with Mike. Early on, it looked like Kai would be the troublemaker of the group, especially after his incident with the nightclub. However, Kai turned out to be a red herring, and Werner caused the biggest headaches for Gus and Mike. Werner, of course, is far from home and dearly misses his beloved wife. Wishing to see her again, Werner pitched Mike the idea of going back to Russia for a weekend, but was denied. Since he couldn't get his superiors' approval, Werner took matters into his own hands and hatched a plot for a loving reunion.
"Winner" reveals Werner ran off to a resort where he planned to spend time with his wife. He made travel arrangements that would see her fly over to America for a weekend and go back home. Sadly for Werner, he never gets to see her again. Mike tracks him down and after a discussion with Gus, realizes there's only one resolution for this setback. Allowing Werner the opportunity to call his wife and tell her to return to Russia before Gus' people do anything to her, Mike then (reluctantly) kills Werner. Ehrmantraut says Werner's death will be covered up as a tragic accident and his men will be sent back. As one might expect, Gus is angered by the lack of progress on the super lab (cutting a conversation with Gale short), which he thought would be completed by now.
Werner clearly had no ill intent (Mike knew he was jut homesick), but when he ran off, his fate was essentially sealed. This was the second transgression Werner committed against Gus - the first being his friendly chat about construction work with bar patrons. These two incidents back-to-back made it very difficult for Gus to trust Werner moving forward, and by now, fans are well aware of Fring's ruthlessness. Mike mentions multiple times in the episode there are other ways to go about things, but he can't convince Gus to spare Werner's life. No amount of begging or pleading has any effect on Gus when he's made up his mind about something. Unfortunately for Werner, he never completely understood what he got himself into and crossed the wrong people.
Lalo also factors into this storyline, with the mysterious member of the Salamanca clan tailing Mike and trying to locate Werner for his own reasons. Lalo does discover which resort Werner is staying at and briefly speaks to the Russian over the phone, posing as one of Gus' employees. Not knowing any better, Werner begins to tell Lalo the first couple of basic instructions for the super lab construction, before Mike arrives in person and interrupts the call. Near the end of the episode, Mike tells Gus about what happened, and it'll be fascinating to see how this continues in season 5. Of course, Fring does not get along with the Salamancas, and despite Lalo's cheeky offer of a peace treaty in last week's episode, the two warring sides will continue their power struggle. Lalo is clearly curious about what Gus is up to and wants to get an upper hand for himself.