It’s a bumpy road to Regionals.

Publicly, the couple remains estranged.

Behind closed doors, theyre having productivenaked lunch meetingsand dutifully making up for lost time.

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Credit: Richard Cartwright/ABC

(Trust me, 007.

When its time, you and I will take down Lockset together.)

Whats the hold up?

Is Beckett waiting for some concrete sign that its time to bring her partner into her vigilante side project?

Or is this delay script-manufactured to set up some future catastrophe?

Castle then takes his mothers frantic call about a body found in a theater where Martha is rehearsing.

Robyn King was a 20-year-old ex-con employed by the theater as a night janitor.

Martha had met her the previous day and liked her.

Shes shaken by the girls death and demands Castle find her killer.

Mama claims she cared about Robyn, even after she got out of the game.

Castle show the symbols to his girl Fridays, Martha and Alexis.

I dont speak emoji, Castle confesses.

They move through a dark and foreboding warehouse and into one of the most wholesome displaysCastlehas ever seen.

Its an a capella jam in full swing.

The crew led by Corbin Bleu ofHigh School Musicalfame goes in on Blue Suedes Hooked on a Feeling.

Its chaos, and every innocent kid with a song in his or her heart scatters, screaming.

As their de facto leader, Robyn took on the duty of giving Agnes the bad news.

She was bothered by the ousting, though.

Possibly enough to kill.

Agnes is certainly acting guilty she ditches her apartment and skips a meeting with her parole officer.

Beckett interviews the bland do-gooders behind the NBP to get their take on her.

While the investigation heats up, Castle and Beckett are engaging in a little theater of their own.

As far as Ryan and Esposito are concerned, the two are still at odds.

But Castle isnt so skilled at the play-acting.

She ran because she knew how it would look, Agnes says.

Robyn had called her former friend to engage her services as a bodyguard at the theater that night.

But as they argued on stage, she was silenced by the Aca-Cons introductory video that began to play.

Just like that, Robyn dropped the topic.

Then a preppy boy arrives in the shot, all turned out for his hero moment.

Robyn herself was too wasted to remember anything that night.

She knew something was amiss in that tape.

If Trust Fund Cardigan didnt tend to Robyns wound, thedrivermust have.

Beckett looks into Robyns arrest and finds that the evidence, including the infamous scarf, went missing.

Alexis pages through the photos from the party and finds the mystery woman.

Fast-forward to Linda telling Beckett that she feared for her career and made a rash decision.

Afterward, she felt so guilty that she founded an entire organization to anonymously make it up to her.

Lindas husband, Scott, is accused it was an accident, he blurts out.

I wanted to make her understand that if the truth came out, it would ruin everything.

Martha smacks him, as well she should.

Later, Castle thanks Ryan and Esposito for solving a case that was so close to Martha.

Yeah, we stilllikeher, Ryan huffs.

When Mom and Dad are (fake) fighting, its the kids that suffer.