Because I was having to deal with my cat, I missed the exact scenario. Holmes either overheard a conversation about "take care of her" and assumed the man was arranging to have someone murdered, or he saw the video on the man's phone . . . Well, both, but I'm not clear about the order of events. It hardly matters. Sum total was that he turned his sights on said man—Decker—and from there it's a race against time and a matter of outwitting the baddie.
The missing woman proves to be an immigrant named Preeda who'd been working on a cruise ship but disappeared on her day off . . . five years before. Instead of being helpful, law enforcement had apparently chalked it up to "another illegal burying herself in the home soil and hiding to avoid being deported." Go, 'Merica.
I won't give away the ending, but I will say this was one of the better episodes I've seen in a while. Elementary seems to be upping its game in the second half of the season. All we've ever really wanted was Holmes + Watson doing their thing, and here they do just that.
There is some Shinwell. Sigh. It's not terrible, though. He tries to set up a drug deal so he can snag some better intel or something, but thanks to the training he's been getting, he notices right away when things start to go south and is able to bail before getting in too deep. Also, he learns to pick locks? But sucks at Spanish? ::shrug::
All in all, a solid episode.