Jess' sister blows into town for Thanksgiving with a troublesome new boyfriend in tow.

The bickering starts immediately, and Kasie copes by reaching for the wine.

Side note: this rental apartment is AMAZING.

NCIS “Turkey Trot” Diona Reasonover as Forensic Scientist Kasie Hines, Lilan Bowden as Robin Knight, and Katrina Law as NCIS Special Agent Jessica Knight.

Diona Reasonover as Forensic Scientist Kasie Hines, Lilan Bowden as Robin Knight, and Katrina Law as NCIS Special Agent Jessica Knight.Sonja Flemming/CBS

Also, she’s got a new fiance her fifth one.

And that fiance’s a villain, not that Knight knows it yet.

“I’m sure CSI will survive a couple hours without you.”

and thanks McGee as he heads out with the ID.

When McGee asks him what that was for, Palmer replies, “I dunno.

I’ve said it before, and I’ll say it again: Jimmy Palmer is the BEST.

Joseph Samuels, presumably the kid in the picture with Charlie.

So was she the intended target?

News of their engagement starts another sister fight that has Charlie screaming at them to knock it off.

Knight eventually asks why Charlie knows more about her job than Robin does.

Has Jess ever lost anyone in the line of duty?

The vibes take a turn for the worse, and that’sbeforeCharlie pulls a gun.

Also, he filled the cell phone bowl with water, so their phones are all dead.

At this point, Robin realizes Charlie was only dating her to get to her sister.

They scramble to reach her, but of course their phones aren’t picking up.

They then give a shot to track them through the information on the business card Jess texted Palmer.

JE is Jenny, who lost her son and her husband in the same week.

RB is Robert, a grandfather whose cancer wasn’t responding to treatment.

“Joe Samuels, your brother,” she says.

Tell her she failed.

Tell her she’s bad at her job.

But don’t ever say she doesn’t care.

As she speaks, Kasie’s in tears.

Robin’s in tears.I’min tears.

Palmer saves the day by suggesting they try the password “Wetsica.”

Double interesting that he knows about the nickname!

They get the information and arrive in time to hear a gunshot go off.

It’s Charlie threatening to kill Robin to make Knight understand what it’s like to lose a sibling.

Kasie is the comedy MVP this week.

“If you could have, you would have,” she says.

Robin falls sobbing into Jess’s arms, and Palmer and Kasie rush to hug them both.

Afterward, the sisters have an honest conversation.

She may not always like her, but she always loves her.

Then they start arguing about where to get tacos, but at least they do it arm-in-arm.