The season finale decides to start us off in a setting I know nothing about, but here's what I can figure. A man arrives at a jeweler; he works for a company, Madison and Beezley, that takes the sweepings from the floor and refines them to get the leftover gold. The dude at the gold place had taken his business elsewhere that got a 2% gold yield (this seems to be a good thing, and clearly, I don't wear a lot of gold because this is all super foreign to me), but they act all buddy-buddy and the jeweler gives the barrels of sweepings back to who I assume is Madison. Madison then heads back to his place and orders a guy named Henry there not to keep a giant fiery furnace over 1000 degrees. Madison then answers a call from his wife or daughter, because we need to know that he was a loving family man and therefore will be the one who ends up dead momentarily. He wishes whoever it is a sticky sweet good night while he shows off the monogram on his sleeve to the camera. All the better to identify said sleeve when it's found later in said oven!
Henry tells Lupo that he left Madison there finishing up in his office the night before, and adds that the furnace was cooling down or else his body would have just been ash, not the clawing charred remains that we're treated to. Bernard comes up and lets him know that they found Madison's keys in the lock on the outside of the door, implying that he'd gone outside and then come back in again. His theory is that it happened at gunpoint for some gold.
The boys are shown the safe with some bricks of gold inside but they won't know if any is missing until the woman there runs an audit. They're interrupted by the arrival of the grieving widow and her father. It turns out she and her father are Beezleys, as in "Madison and Beezley" -- when the two married, the families merged. The tone of his voice and his lack of any emotion over the death seem to imply that he wasn't a big Madison fan. Mrs. M. tells the boys that she last spoke to her husband when he said he was going to finish up some paperwork, and then she went to her father's house. There were no problems between them at home, and Beezley tells them that though the price of gold made things more competitive, the company had good relationships with its customers. Just like the one we saw in the first scene, I'm sure.
Back at the office, Anita reports that Madison was killed with a blow to the head before he was baked in the oven. Lupo is going through their financials and confirms that business was good. But he then notices they made a payment to 7Q Partners, which rings a bell since it doesn't sound like a jeweler. Madison made a $5,000 payment to them the day before he died, so Anita puts on her Captain Obvious hat and tells them to investigate. Turns out the company has no physical address, and the account was opened with money wired from the Cayman Islands and had other deposits from New York, Miami and the Middle East from names like George Smith and Fred Miller. I have heard that generic American names are all the rage over there right now. All signs point to money laundering, and Lupo points out that both drug dealers and terrorists like gold.