- Did a word that's important to you go missing?

- And now all you can feel, do, or think is the opposite of that word?

- Then call us!

I'm Sly.

- And I'm Gabby!

We're Word Detectives, and we solve word mysteries!

- Word mysteries!

Together, we run the Wordsville Online Detective Agency.

- We'll find your missing word fast.

- Not to mention briskly.

- And swiftly!

- Yeah, we're really good with words.

- [Gabby and Sly] Wordsville!

[gentle music] - You're doing great, Gabby.

- Thanks, Sly.

The key is to be as calm and quiet as possible.

- Copy that, but for some strange reason, I'm starting to feel so excited!

Go Gabby!

[cheers] [cups clattering] [Gabby sighing] - Why?

Why are you talking so loud?

And why do I also feel so excited?

[gasps] Could this be a word mystery?

[video call beeping] - Probably, Vet Wilder's calling.

- Word Detectives, the word tranquility has gone missing!

- [Sly and Gabby] Yes!

It's a word mystery!

- Tranquility means when [mouse clicking] things are pleasantly quiet and calm.

- That's exactly how I wanted my clinic to be for Pet Adoption Day.

That's why I put up the sign.

It says, "Tranquility please," to remind people to be quiet and calm for the animals.

But someone tore off the "Tranquility" part.

- So now we're being loud and rowdy!

- And boisterous, according to the dictionary, those words all mean the opposite of tranquil.

- We're not the only ones.

All the animals at my clinic are full of energy!

[goat bleating] [dog barking] [mouse squealing] [cat mewing] [elephant trumpeting] Can you hear that?

- Vet Wilder, tell us everything that happened, and I'll animate it.

Recap time!

- I was putting up my sign to get ready for Pet Adoption Day when Scientist Cosmo and Firefighter Ember came in.

They were both being loud and boisterous.

I pointed to my "Tranquility, please" sign, since most animals need quiet and calm so they don't get nervous.

Then I went to go get some more pets for them to meet.

But when I got back, Scientist Cosmo and Firefighter Ember were both gone!

And so was the word tranquility.

I shouldn't be excited, but I am.

- We get it!

Vet Wilder, can you show us the scene of the mystery?

- Of course, take a look.

[button beeping] - I'm saving this for our case notes.

[camera clicking] Woo-hoo, let's solve this word mystery!

- Please hurry, even my goldfish are being energetic and boisterous.

They're doing somersaults.

[water sloshing] - It's time to start our case notes.

When I say case, you say note.

Case!

- Notes!

- Case!

- Notes!

- Boom!

What do we know so far?

- [Gabby] We know what happened.

Someone took the word tranquility, and to everyone, it's the opposite of tranquil.

- [Sly] At the vet clinic is where it happened.

Vet Wilder went to get some animals for adoption.

- Animals, so Scientist Cosmo and Firefighter Ember are suspects.

Now, to figure out who did it, how, and why.

Let's look at the clues.

- [Sly] There's a sound meter and a pet-sized firefighter helmet.

- Oh, that helmet is so cute.

- I bet the sound meter belongs to Scientist Cosmo.

Let's call him.

[video call beeping] [pans clanking] - Word Detectives, hello!

- Scientist Cosmo, why are you banging on pots and pans?

- I'm doing a sound experiment that measures loud sounds.

- Vet Wilder told us you are being loud at Pet Adoption Day.

- Yes, I asked Vet Wilder if he had any loud animals that went [barks] for my sound experiment.

- Is that when Vet Wilder pointed to his "Tranquility please" sign?

- Yes, he told us most animals need quiet and calm, then ran off.

That's when I had another idea for my sound experiment.

So I left, accidentally leaving my sound meter behind.

- Were you annoyed when he left?

- A little.

Now, if you excuse me, I have important work to do.

[pans clanking] - Being quiet and calm wouldn't be very helpful for Scientist Cosmo's loud sound experiment.

- And he was annoyed.

I bet he did it!

- Let's interview Firefighter Ember before we make our conclusions.

[video call beeping] [bell tolling] - Word Detectives, hello!

How can I help you?

- We heard you were at the vet clinic today, being loud and boisterous, which is the opposite of tranquil.

- I was, but only because I was so excited to adopt a pet and have a buddy to drive around within my fire truck.

- That does sound exciting.

- Right, I even had a special helmet made for my future pal.

I was bursting with excitement.

- Is that why Vet Wilder pointed to his "Tranquility please" sign.

- Yes!

He said, "Pets need quiet and calm, or they get nervous."

And I often talk loudly so people can hear me over sirens!

- That's a good point.

- Right?

Plus there's lots of fun stuff at the fire station that makes me super excited.

Like, when I slide on the fire pole and jump.

[cheers] - We're getting off track!

- 10-4, after Vet Wilder told me, "Pets need quiet and calm," he left without asking me about adopting!

I guess he didn't think I should adopt a pet.

Anyways, I really need to ring this bell.

[bell tolling] - Now, we have all the facts, let's review our case notes.

- [Gabby] Scientist Cosmo couldn't do his loud sound experiment at the clinic because it made too much noise.

- [Sly] And Firefighter Ember was being boisterous and loud because she was excited to adopt a new pet.

- Wait, Scientist Cosmo could do his experiment someplace else.

He didn't need to take the sign.

- But Firefighter Ember couldn't change that she often talks loudly or that she really wanted a pet!

- A pet she thought that Wilder didn't want her to adopt.

[gasps] [party horn trumpeting] - I think it's time to reveal who did it, how, and why.

[video call beeping] Now, presenting the word mystery animated reenactment of The Case of the Not-So-Tranquil Town.

- We need to be calm, quiet, and tranquil for Pet Adoption Day.

- Good morning!

I'm doing an experiment on loud sounds.

- And I wanna adopt a pet.

Woo-hoo, check out this super cute helmet.

[Vet Wilder shushing] - Tranquility, please.

Most animals need it to be quiet and calm so they don't get nervous.

- Wait, aren't you gonna ask me about adopting a pet?

- I have an idea for my sound experiment.

I'll go to my lab, where I won't have to be quiet.

- I guess I don't get a new pet unless... [sign ripping] - Firefighter Ember's who did it!

- I'm shocked.

- Firefighter Ember, you tore down my sign?

- When she was alone, that's how she did it because she really wanted a pet, that's why!

- They're right.

I'm sorry, Vet Wilder.

You said, "Pets need quiet and calm," and I'm so loud, and so is my fire station.

And that's why you rushed off without asking me about adopting a pet!

- But- - I thought if I took the word tranquility, pets would be okay in a loud and boisterous place, and I could get a new buddy.

I understand why you did it.

Having a pet is amazing.

Bring me the word tranquility back.

I have an adorable surprise for you.

[video call beeping] Thanks for returning the word tranquility.

I wasn't mad when I rushed off before.

I went to find a pet for you, like this guy.

His name is Ace.

[button beeping] - Aw.

- Aw.

- He'll be perfect for you because he's boisterous, and he likes living in a noisy place.

- I love Ace.

He's going to look so cute in his new helmet.

Thank you, Vet Wilder.

I promise Ace will have some calm and quiet times too.

- But when he's loud, I can use his sounds for my experiment.

- Thanks, Word Detectives.

- Thanks, Word Detectives.

[Sly sighing] - Case closed.

- In the quiet over the last few minutes, let me finish doing this.

[faint upbeat music] - Cool, can we be boisterous to celebrate solving our case?

- Absolutely!

[Gabby cheering] [Sly cheering]