Well, that was maybe 10 minutes worth of entertainment.

We got a ho-hum case of the week paired with some much-needed follow-up on NCIS: Los Angeles Season 9 Episode 20.

The main storyline was the case of the week, such as it was.

The good news was that Mosley didn't mess with the teams this time around.

So that meant Callen and Sam, aided by Nell, searching for a missing classified doohickey, while Deeks and Kensi, helped by a hyper-caffeinated Eric, sought the inside man at the rocket manufacturer.

Related: NCIS: Los Angeles Season 9 Episode 19 Review: Outside the Lines

The Densi and Eric pairing was the more fun of the two. I loved seeing Eric act like a little kid up until the time his space-geek self finally understood that he wasn't getting anywhere near Proxima's headquarters.

Fortunately, Eric was able to root out the true culprit based on his coding style. Seriously? Try to get that theory to stand up in a court of law. Fortunately, Donald folded up like a cheap suit, so they didn't have to put that to the test.

I'm surprised that Donald lasted as long as did he before he got exposed, as nervous as he was.

What an ingenious plan Deeks had so that he and Kensi could back up Donald! Kensi as a bartender is old hat, But Deeks as a golfer was something different. I figured he just did water sports.

And wasn't fencing with golf clubs pretty much inevitable, leading to Deeks' bad pun? I guess that's par for the course.

Related: Watch NCIS: Los Angeles Online: Season 9 Episode 19

Meanwhile, out in the Angeles Forest, Callen and Sam had their own problems.

No one was concerned when a three-man search party goes missing? Good thing Sam and Callen are used to, well, stretching their orders. That was the only way it became apparent that the search effort had been infiltrated.

I was glad to find out that the campers in the first scene hadn't gotten blown up, although the guy might have been happier if that had happened.

I'm sure the campers, Vanessa and Dave, just thought they were being helpful when they broadcast the location of the rocket's payload. Too bad they both couldn't do the smart thing and bug out, as Callen had suggested.

But there wouldn't have been the drama and brief firefight if they had done that.

Callen and Sam rightly recognized there was more to the mission than retrieval of the payload. The would-be thieves had too-good intel, so there had to be someone on the inside who was involved as well.

Who out there picked out the super-helpful Gates as the traitorous inside woman at the search site? It's always the one everyone least suspects. It certainly wasn't the officious mission director, worrying his next promotion had just blown up with the rocket.

Related: CBS Renewals: Which Major Show is Missing?

So Gates was running interference, slowly down the search as much as possible, so that her boss's men could get to the device first.

And the only way she was caught was pretty much process of elimination. Gates was last seen with the package and was now missing, so, therefore... 

What's the old Sherlock Holmes line: "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."

(BTW: Elementary returns at 10 p.m. Monday, April 30, on CBS.)

Next, there was Hetty and Harris Keane spending time together, given short shrift for a case that truly wasn't rocket science.

Not surprisingly, Harris was having trouble getting re-acclimated after spending decades as a prisoner of war.

Instead of getting help, he was writing letters of atonement to the families of people that he had killed.

Fortunately, by taking Harris to see George Nelson's grave, Hetty got him to understand that all of those exposed to Orange Agent during the Vietnam War have only a short time left and need to make the most of it

Related: Get CBS All Access via Amazon Channels for Hit Shows, Exclusive Originals & Live TV!

By episode's end, Harris wasn't exactly embracing life, but at least he was contemplating calling Nate to talk about what he was feeling. I'm sure we'll never see that session, but it would certainly be a start.

Hey, the writers may finally have figured out how to use Mosley best. She gave out the assignments, made a pithy observation about Eric, then faded into the background.

If you don't give the haters something to hate, maybe, just maybe, Mosley can be salvaged.

To follow this season's rocky road, watch NCIS: Los Angeles online.

Which team did you enjoy more? How soon did you figure out the case of the week? Is Harris on the right path? Comment below.

Dale McGarrigle is a staff writer for TV Fanatic. Follow him on X.