(howling) - I'm upset too, Olaf.

- Actually, he was asking if the library has any security cameras.

You know, to review the tapes from this morning to see if there's anything unusual.

- I really misread that howl!

- There's a room with security cameras at the far end of the library.

- Alright, here's the plan.

We're going to open the doors-- - AHH!

(doors sliding) - Hey... - We're going to follow Olaf.

- AHH!

- (Oren): Run!

The books are gaining on us!

- (first librarian): Come on, run!

- (second librarian): Security room is to the left!

-We made it!

- I got a paper cut.

(hammering on door) - Here are the security camera monitors -- I'll cue up all the footage from this morning.

(mooing) - (Oren): These three villains visited the library this morning: Double Dave... (gasping) - Tammy 10-Spot... (gasping) - ...and Even Steven.

This would go a lot faster if you saved your gasps until the end.

- Oh, yeah... Save my voice.

- I can see that.

- Double Dave likes doubling numbers, so if you start with 2 then double it, you get 4.

Double that, you get 8.

Tammy Ten Spot -- she likes to count by 10s.

10, 20, 30, 40.

And Even Steven -- he's only into even numbers.

- Which is any number that can be divided by 2, or in half.

To fully illustrate this concept, these 4 security monitors are an example of an even number.

2 here, 2 here.

4 divided in half.

- Oh... - Now you can gasp.

(gasping) - Uh, so...which of them did it?

- Well, each villain has a "thing" for numbers, and every book in the library has a number on the spine.

- Yeah, that's how I organize them on the shelves.

- If we catch some of the flying books, maybe the numbers can help us find out which villain did it!

- Great!

Uh, uh, wait... - Uh... - When you say "catch some of the flying books", you mean with our hands?

- I wouldn't use your feet!

Ha!

That's Olaf's thing.

- (Olaf): Yay!

(beeping)