As night falls, Flash races into the school. Looking around for any sign of trouble.

He walks over to the boiler room door. He hears the same noise from earlier that day.

(Clank! Clank! Clank!)

Flash: There's definitely something in there.

He grabs the handle, the door opens to a dimly lit hall.
An almost eerie feel washes over Flash.

Flash: Who's there?

No one replies.

Flash begins to walk inside the corridor, when someone grabs him by the shoulder.

He quickly whips around, to see Cat Noir standing behind him, holding a flashlight.

Flash: Oh, it's you.

Cat Noir: What are you doing here, Flash?! It's after school hours!

Flash: Just following a hunch, I just hope I'm wrong.

(Clank! Clank! Clank!)

They turn back to the direction of the noise.

Cat Noir: Well then, let's just see where this hunch goes.

They creep slowly down the corridor.

At the Agreste Mansion.
Gabriel stands at his terminal, going over fashion designs.

When suddenly, Tomoe Tsurugi bursts through the door and attacks him with her Bokken.

Tomoe: Gabriel-san! HOW DARE YOU STEAL FROM ME?!

She pins his arm down on the console, the screen cracks and buckles from the impact of her walking stick.

Gabriel: Tsurugi-san, calm down.

Tomoe: Don't tell me to calm down!
Last week, one of my prototypes went missing from the vault! And when I checked the last known location, it led me here! Now hand it over!

Gabriel: I assure you, I have no idea what you're talking about!

Tomoe: Don't lie to me!

Future Lila and Reverse Flash watch the security feed.

Tomoe: "I know you're hiding it here, somewhere!"

Gabriel: "I swear, I'm not hiding anything!
Just calm down and we'll attempt to sort this out."

Future Lila: (Chuckles) This is too easy.

Reverse Flash: Indeed. I have to admit, taking the tracer on the device and planting it in Gabriel Agreste's house was a stroke of genius.

Future Lila: Exactly, that way it directs attention off of us.
So, how was your search for our missing piece of the puzzle?

Reverse Flash: Well, it-

(BEEP, BEEP, BEEP, BEEP!)

A monitor starts blinking red.

Future Lila: Hold that thought.

She taps on the keyboard and pulls up the feed.

Reverse Flash: What is it?!

The screen shows Flash and Cat Noir, snooping around the school.

Future Lila: It's that mangy alley-cat, and that supercharged speed freak! They'll ruin everything!

Reverse Flash: Should I handle this?

Future Lila: No, we still need to continue our search…

Future Lila: "…for the missing component."

Tomoe and Gabriel sit down and discuss the situation.

Tomoe: The device's tracer led me to your residence, Gabriel-san. It's saying it's located right in your vault.

Gabriel: I assure you, Tsurugi-san.
This vault is under my 24-hour surveillance.
If something was tampered with it, then I'd know about it.

He moves the painting revealing the vault behind it.
Gabriel enters the passcode and the vault door opens.

Gabriel: There, you see? There's nothing in-

There, sitting in the vault. Was the device's tracer.

Tomoe: Is that what I think it is?

Gabriel: That depends, what exactly was so important about this device, that you would put a tracking device on it?

Tomoe: Something both incredibly valuable, and extremely dangerous in the wrong hands.

Meanwhile, at Francois Dupont High school. Cat noir and Flash reach the boiler room.

Flash: I don't like this place, one bit.

Cat Noir: You get used to it. It's less creepy in the daytime.

Flash (TB): "This place seems right up Bruce's alley.
Though, personally. I think I'd rather be surrounded by bats."

Then as if on cue, the noise is heard, both Flash and Cat Noir jump at the noise.

(CLANK, CLANK, CLANK!)

Flash: It's coming from over there.

(WHOOSH!)

Flash: Cat, get over here! You're gonna want to see this.

He leans over, and grabs Ms. Mendeleiev out from the corner. Her arms and legs tied up, her mouth duct-taped.

Mendeleiev: (Mmm, mm-mmm, mmm!)

Cat Noir: Ms. Mendeleiev, what's she doing here?!

Flash: Let's find out.

He quickly and carefully peels the tape off.

Mendeleiev: (GASP!) Thank goodness you two are here!
I've been trapped here for weeks.

Flash: Who did this to you?

Mendeleiev: It was that man with the brown suit.
He kidnapped me, and tied me up here.

Cat Noir and Flash look at each other in realization.

Cat Noir and Flash: Professor Wathen!

Flash: Was he here recently?

Mendeleiev: Yes, he did. After he came to give me my food rations, he said that he needed something, for some sort of device.

Cat Noir: Did he happen to say where he was going?

Mendeleiev: All I heard him say was that he was heading back to a warehouse, and some sort of tech company.

Flash: Anything else?

Mendeleiev: Not really, no.

Flash: Okay, I'll take you to the police station, so you can give them your statement.

(WHOOSH!)

Flash rushes off, and returns two seconds later.

(WHOOSH!)

Flash: So, it's official. Professor Wathen is not what he seems. Guess that means my suspicions are right.

Cat Noir: Your suspicions?

Flash: Yes, something felt off about him, since he first arrived.

Cat Noir: But what exactly could he be up to?

Flash: No clue, but it can't be any good.

At the Agreste Mansion, Gabriel inspects the tracking device he discovered in the vault.

Gabriel: It would help if I knew exactly what the device was, Tsurugi-san.

Tomoe: It was a prototype capable of altering particles for any particular need.

Gabriel: So anyone who possess it, can alter the molecules of any object.

Tomoe: Precisely, Gabriel-san.

In Reverse Flash's lair, Future Lila watches from the screen.

Gabriel: "Well, I don't know where your device is,
but I promise to alert you the moment I find it."

(ZOOOM!)

Future Lila: Please tell me you found that last part we need.

Thawne takes off his mask.

Thawne: (Huff) Regrettably, not.
I've combed the ENTIRE city, and I've not found one trace of it, anywhere!

Future Lila: (Growls) CURSES! Looks like we'll have to find some other means of finding the component we need.
And as if that wasn't troubling enough, Flash just freed Ms. Mendeleiev, and took her to the police!
So your cover is DEFINITELY blown, now!

Thawne: How unfortunate.

Thawne strokes his chin for a second.

Thawne: Didn't Allen have something that would help him detect any particles in a surrounding area?

Future Lila: I think he said something about a Particle Scanner, when he told my past self what he was hoping to accomplish. Let's see if I can find it.

She taps on the keyboard.

Footage shows Flash using the Particle Scanner on Alix.

Thawne: There, that's what we need.

Future Lila: And we know exactly where to find it, too.