CSI - 'Risky Business Class'

The episode opens with sounds of a distress call from an airplane superimposed over shots of the CSIs working in the lab - one of which is Sarah leaving a phone message for Grissom, which immidiately made me panic because I thought he might be one of the victims on the plane... Man, that would suck. But it's ok! He's not on the plane!
However, the plane (a small charter) did miss the Mediterranean BARELY and slammed into the ground mere miles from the Strip, so people are worried it was a planned attack.
They find 4 bodies among the wreckage - the pilot, and 3 passengers: 2 male 1 female. It's harder to identify te passengers because they aren't on any manifest, since the plane is so small it doesn't require one. A guy from the NTSB who Sara used to work with ages ago (and apparently they were pretty close) has shown up to investigate the crash, which leads to some awkwardness, since she's MARRIED!
Also shown up is Donna, the awesome geneologist who always refers to Greg as Hojem-Sanders; she is going to do a family tree for Morgan to give her father for Christmas.  

Yaaay Donna! She makes me laugh - and
with her around, there's lots of Greg on-screen!

Turns out one of the people on the plane was a veteran with a grudge against the Mediterranean Casino, because he lost a lot of money there and then they kicked him out, so he used to sit out front and prevent people from going inside. It's a theory that he hijacked the plane in order to try and make it crash into the casino.
The reason the plane crashed was because the door popped open - and at the altitude they were at, there was no oxygen and everyone died instantly. The door seal was tampered with, using tools that belonged to a mechanic at the airfield, but he was out of town for a week.
Morgan finds a gun in the plane, a gun which belonged to a lawyer who was very much alive - but says that he lent the gun to a colleague of his, who had some pissed-off and violent clients he needed to protect himself from. So that's plane-crash vic number 2.
Then Greg comes into the lab with quite the twist - there was a body found in a woman's swimming pool across town, and it has been identified as the pilot who was flying the plane. So there was a third unidentified male victim on the plane.
That victim is identified as being a stripper who was dating the pilot - except the pilot was supposedly in a relationship with his business partner, the guy who owned the planes and CSI interviewed earlier. It would make sense, motive-wise, for the partner to be the killer, but he professes he's innocent, and even though the plane was insured and his boyfriend was cheating on him, he 'lost everything' in that crash. Poor guy.
In addition, a video from the airfield shows the partner fueling up the plane and doing the last safety checks several hours before takeoff, and then leaving. A few hours later, someone else (who they can't quite see, but it looks nothing like the partner) pulls up in a fuel truck and does something - probably damaging the door seal, but it's hidden by the truck - and then leaves 2 minutes later. Sarah recognises the clothing they're wearing as belonging to Hal, the mechanic, but since he was out of town at the time, whoever 'borrowed' his tools obviously took his coveralls too. They recover DNA from Hal's coveralls but can't match it to anything.
The woman victim is identified through a package she was carrying - it's a kit used by a DNA-processing company to test for paternity, and they ran the kit number and found the woman's name. It turns out she was not finding a father of a child, rather she was looking for her own father. This is where Donna comes in - using an ancestry website, she finds that the woman, Jordan, was looking for a man with the last name Jordan and found him - except he died in 2005. He did, however, have a daughter named Helen who was still alive, although barely, she was in a car accident when she was younger and had severe brain damage so she was in a home.
They take Helen's DNA and then find that she was not related to Jordan, paternally or otherwise. But after a long discussion they realise that Donna's tracing could not have been wrong, but the DNA couldn't have been either - so that means this woman wasn't really Helen. They also discover that the father was very rich, so Helen's inheritance was being used to keep her in the home (which I understand is quite expensive).
They go back to the home and find that 'Helen' had been moved elsewhere, and her room completely cleaned. No fingerprints, no DNA left to be had anywhere. BUT THEN my boy Greg is so smart and finds a print on the inside of one of those things they clamp on your finger to take your pulse.

One of those things.

He gets a match to this fingerprint, and a DNA sibling match between the the woman at the home and the person who stole Hal's coveralls. The woman at the nursing home was identified as the sister of the lawyer from earlier, who had been in a skiing accident years earlier which had caused her brain damage. The lawyer also happened to be the one who was in control of Helen's inheritance, so he was using the funds to put his own sister in Helen's place, had the real Helen hidden away at another home, and the real target of the crash was Jordan - or, rather, her test kit, which would have not only identified her as a rightful heir to some of the money he was stealing, but would also expose his fraud.
And it also turns out he owns his own airplane and was about to board it for a 'business trip' out of town - until the cops pull in and stop him.
Captain Brass, every the dry-witted one, greets him with this hilarious line:

"Checked your door seals lately?"

and tells him, basically, that 'the jig is up', the doctor-accomplice at the home had confessed to the whole thing, and that he's going down for murdering 5 people. That case was confusing, but really interesting at the same time.
Back at the lab, Donna says her good-bye to Russell, and she asks him "you don't really thing of geaneology as a pure science do you?" and he responds with this beaut of a quote "I wouldn't say that. It is after all systematic pursuit of knowledge. Seeking an understanding of who we are and where we can from. That sounds like science to me." All together now: Awwww....
After that, she gives Morgan the Ecklie (or Ekli) family crest, which apparently is adorable because it has pine trees and reindeer on it (but we never get to see it) and Greg and Morgan say 'perfect for Christmas' and she tells them that they're really cute together - but they should be careful, because both of their family names are Norwegian, so they might be related. But 'probably not'. HAHAHA and I agree, they are damn adorable! (Although half of 'them' is Greg, and he paired with a brown paper bag would be adorable.)
Sara says an awkward goodbye to her friend from the NTSB and they hug, for an awkwardly long amount of time, and he tells her she looks great, and I'm confused because of all the women ever on that show, Sara is really not that attractive... Although she is awesome. AND MARRIED. TO GRISSOM. DON'T FORGET THAT, MISSY.