"Phineas? Ferb? Where are you going?" Isabella called after the rapidly retreating figures of the brothers on their bicycles. She had walked out due to curiosity.

But Phineas and Ferb couldn't hear her. Isabella stood there, in a dilemma as to what to do. She could still hear Phineas: "Wait here for me, Isabella." She had brought her bike over, as she was invited over for the night, and Phineas had hinted they might be going somewhere tomorrow. What do I do?

Tell Candace? No, that's ridiculous. She's over at Jeremy's house. The newlyweds are having fun. And she's already pregnant with Xavier! Isabella couldn't stifle her jealousy.

Only one choice then for Isabella.

She donned her helmet and sped off after the brothers.

Irving's house? She couldn't think of a less likely location for Phineas and Ferb to be, and yet there was Phineas' red bike against the fence.

That's when she saw the shattered window. And realised she was in way over her head.

What are we doing here? Where's Phineas?

All sorts of silly thoughts ran through Isabella's head. She pushed them back, but one thing stuck.

I have to get in there!

She was reluctant to use Phineas' bike as a boost and dirty it with her shoes, but she had no choice. She clambered over the fence into Irving's backyard. She crossed it in a trice.

And arrived at the shattered window. "Phineas? Irving?" she shouted.

Just like Phineas and Ferb before her, she got no response.

Where are they? They wouldn't possibly ignore me. Either they can't hear me, or they're not here. But Phineas' bike is here. So if they're gone...was it free will? Or...

She pushed the thought out of her mind. It can't be! She called louder. "Phineas?"

No answer. She peered at the living room and got another shock.

Who made this mess?

She barely had a second to think about it, however.

Because right then, a hand clamped over her mouth, and someone tied her up.

"We'll take her, too." a gruff male voice said.

Someone gagged Isabella, and immediately she felt the suffocating effect. I can't breathe!

She wanted to scream to Phineas, to warn him that bad men, very bad men, were here. But she couldn't even draw breath to feed her oxygen-starved brain.

That's when the man's companion said-

"Should we wait for the other two?"

"Well, they were just here. It could be awhile, because he wants a word with Triangle Boy and Greenhead."

At that, Isabella really did scream and struggle. Never mind that no one could hear her, never mind that she couldn't break free, all that mattered now was that they had him-

"Yeah, let's get it done. This one's becoming restless." one of the two men said.

"But what if he wants a word with her?"

"Not asked, not answered. The sooner we get this over with, the more time we have to ourselves. And time is money, man…"

And the two men picked Isabella up as easily as if she had been a feather. They dumped her in the back seat of a car and sped off.

Help! The gag is suffocating...

Isabella was going to pass out. Her brain was starved of oxygen.

Her last thought was of how foolish it seemed in retrospect to come here.

She didn't know how long it was since she passed out, but she was here again. Then her door opened. The two men dragged her roughly out. The bigger of the two looked at Isabella, and said, "When I remove this gag, you will not struggle. You will not scream. Is that clear? There was something in his black eyes that suggested he wasn't joking, that he would do more then kill her should she disobey.

Isabella nodded mutely, willing him to remove the gag. And fast.

The man pulled out her gag. Isabella took long, searing gasps of air that burned her lungs as much as it refreshed her.

Then she was roughly pulled along by the two men. They walked in what seemed like a wood and came to a grassy clearing. A lake was off to their left.

As if by instinct, Isabella tried to check that her pink bow was still in her hair.

Seeing what she was doing, one of the men said, "Oh, don't worry, pretty. You'll be plenty wet where we're going.

Isabella stared. Surely he can't mean the lake?

But that was precisely where they were heading now.

Isabella asked, her voice rising despite the man's warning."Where are you taking me?"

All she got was a "You'll see" from one of the guys and a harsh backhand from the other.

That's when she saw the suits by the lakeside, with awkward helmets.

One of the guys stuffed her into one of the suits, not even bothering to untie her. The other made sure everything was fastened down safely.

Then, after donning their own suits, they threw her headfirst into the lake.

She screamed. What are they doing? Surely they wouldn't put me in a suit and let me drown? Or would they?

Nevertheless, one fact stuck out like a sore thumb.

At last, Isabella was alone.

But it didn't last for long, as the men jumped in with her-

-and started pulling her down!

Where are they taking me?

They sank very past and reached the bottom in a trice. Presumably they must have had weights or something, as that was the only way they could have descended so fast.

At the bottom, Isabella saw one of the men groping for something on the lake bed. The other man held on to Isabella tightly.

The searcher found his quarry, and he pulled what seemed to be a lever. Instantly, a circle of lake bed vast enough to admit two people side-by-side moved aside. Isabella had seen enough movies to know what it was.

A secret entrance?

Then the men dragged her into what appeared to be a tube and the entrance closed off behind them. Isabella and her captors were now in a cylindrical, sealed-off segment about seven feet tall, with lakewater still swirling around them.

Then the lakewater drained and the floor opened. They slid down a tube for about fifteen feet, and then-

-hit the ground. A plexiglass door was ahead of her.

The two men ripped off their suits and took off Isabella's, too. For the first time Isabella could get an unimpeded view of her surroundings. The door opened.

She was in what appeared to be a marble atrium. Doors branched off in all directions. Where is this place?

The men led her towards one particular door.

"Where are you taking me?' she asked the men.

No answer. Isabella wasn't even sure if she wanted to know.