What’s Going to Happen to Kim on “Better Call Saul?”

It’s the biggest mystery left, and maybe the only one that matters.

Tonight, Monday, April 18, “Better Call Saul” will air the first two episodes of its sixth and final season. The show, famously a spinoff of “Breaking Bad” and its sleazy “criminal lawyer” character Saul Goodman, played hilariously by Bob Odenkirk, debuted in February 2015. It seems a lot longer ago than that, though. The world sure has changed a lot since February 2015.

The show will wrap up its prequel story, yet another part of the extended “Breaking Bad” universe. (The Netflix film El Camino followed Jesse Pinkman’s journey after the final episode of that show in a highly entertaining movie written and directed by show creator Vince Gilligan.) It’s not yet known if there are any more spinoffs coming, but I’d sure love one: While “Better Call Saul” has never been as wildly popular as “Breaking Bad” was — which may say more about the era of television in which it airs than the show itself — it is just as good, and, at times, even better. A large part of this is because of Odenkirk’s terrific performance, which is subtle and surprisingly dark without losing what is inherently funny about the character. (It helps that Odenkirk has made Jimmy McGill, the man who was Saul Goodman before he was Saul Goodman, so lovable despite being so flawed.) But I’d argue the biggest reason is Rhea Seehorn’s role as Kim Wexler.

Kim Wexler is every overachiever you’ve ever known, a girl who grew up in nowhere Nebraska with an alcoholic mother and no real prospects. But she was smart, and driven, and ended up making her way to Albuquerque, for reasons that still aren’t entirely clear. She became a diligent, highly competent lawyer, but, for the first half of the series, she has one major flaw: She loves Slippin’ Jimmy McGill, a shady lawyer who, it seems inevitable, will drag the upstanding Wexler down with him. But as the show goes on, it become clear that Wexler actually loves Jimmy’s schemes, and may be particularly talented at pulling them off herself. It makes them a terrific team, but also a self-destructive one. Everyone knows Saul Goodman is shady, so if he gets caught in a scheme, people just shrug. But Kim Wexler is a superstar. Every scheme she’s involved in — including…