Among Georgia O'Keeffe's numerous painting's of her home's patio door, two 1954 companion works differ only in their use of color. "Black Door with Red" has vibrant reds and yellows contrasting with the black doorway in the center. In "My Last Door," however, the red background is replaced with white while the yellow accents become shades of gray. Interesting, then, that "Breaking Bad," a show known for its use of color, chose to showcase the monochromatic work in tonight's episode which, like O'Keefe's painting, was muted only in its tone.

When the episode ended, I initially felt like it was little more than a functional bridge between the season's incredible middle episodes and whatever action would play out in the final two hours. But later I realized how much happened tonight. Skyler volunteered to be Walt's money launderer. She also revealed that, well, she never quite got around to filing those divorce papers. Oh, and Jesse stumbled upon the identities of the dealers who killed Combo last year. Just as the O'Keefe painting first bored Jesse to sleep before ultimately inspiring a lively debate with Jane, this episode's quiet demeanor hid a lot of drama under its surface.

Jesse and Jane's flashback debate about O'Keefe's tendency to paint the same subject over and over foreshadowed a conversation between Walt and Gus. In the former, a bored Jesse suggested the painter wanted to paint one perfect door. To Jane, however, it was an exercise in contentment: "That door was her home, and she loved it. To me that's about making that feeling last." The latter conversation occurs after Walt learns his marriage might not be as over as he thought, seeing a chance to perhaps go back to the home he loves. Gus, on the other hand, favors perfection, cautioning Walt not to make the same mistake twice. Which mistake? There are any number of things Gus may have been alluding to. If he's spoken to Saul, he knows Walt is letting his wife even deeper into his dark life. If the entire White family was in danger with only Walt involved, the risk jumps higher with his wife cooking the books. But if Gus does have Walt's lab bugged, it's more likely he's voicing concern yet again about Jesse. (As he told Walt before: "You can never trust a drug addict.)

And there's now a lot to be concerned about. In addition to skimming product, Jesse will now want to get even for Combo's murder. That kind of direct violence isn't Gus's style, so he'll do whatever it takes to keep Jesse in check. I have to admit, though, I was surprised how well Jesse hid his anger when quizzing Andrea about her brother, especially since he'd blown up at her just a couple of minutes before.

As for Skyler, her offer to run Walt's financial schemes seems to be more about love of money than love of family. And she can even use her corruption for passive aggressive gain. When Walt protests her involvement after their powwow with Saul, she tells him it's too late for that. "This is what happens when you decide pay our bills with drug money." She, of course, leaves out that she's the one who decided to pay Hank and Marie's bills, too.

This sneaky little episode set up quite a few big developments to play out in the season's final two episodes. Walt's guilt-ridden decision to bring Jesse into the operation now shows multiple ways to end badly for both of them.

A few random thoughts...

• My favorite use of color tonight was Walt's clothing choice for his visit to Gus's house. He had on his now standard blue shirt, but covered up by a brown jacket that perfectly matched Gus's own sweater. The jacket may not be quite as suffocating as the yellow hazmat suit he has to wear in the lab, but even on a social visit he's still Gus's man, albeit with a bit more of his own personality peeking out.
• Since Bob Odenkirk joined the show last year, most of the series' blatantly humorous moments seem to involve Saul. This allowed the rest of the show to become darker than its first season while not losing the black humor it does so well.
• Saul on Skyler: "Clearly his taste in women is the same as his taste in lawyers: only the very best, with just the right amount of dirty."
• Saul on car washes: "Hey, how come you guys always get with the air freshener? I explicitly say I want no air freshener, and every time I driver away smelling like an alpine whorehouse."
• Saul on marriage: "Is that you talking or Yoko Ono?"
• Saul on commitment to a story: "I once convinced a woman I was kevin costner, and it worked because I believed it."