Summary: "I'm sorry I need to leave, but I think that we both need time, so I'm leaving for the city where I can forget it all." Only one problem, what city is that? And Phineas has to find her, or lose her forever.

A/N: Hurrah! Another chapter! Right, so I'm gonna really enjoy this story a lot.

Alright, so in this chapter, Phineas begins searching for Isabella...

Chapter 2: Starting the Search

Phineas knelt in the grass of the backyard, his faithful stepbrother right beside him, both working on the one project that meant more to Phineas than anybody else. It was a genetic tracker. It was meant to find the genetic strand of a specific person based on what was fed into the machine, then it would scan the entire world for the same matching DNA.

"So, once it is set up, I have a couple hairs from Isabella's hairbrush, we can use it to track Isabella's hair to anywhere in the world..." Phineas explained to Ferb, who nodded in agreement and continued working.

Within ten minutes, Phineas was feeding Isabella's hair to the machine.

Genetic Material on item known as hair is identified to the person named Isabella Garcia-Shapiro. Is this true?

Yes. No.

Desperately, Phineas pushed the yes button, willing the computer that he had built himself to go faster.

Hair belongs to Isabella Garcia-Shapiro confirmed. Enter search area.

Phineas quickly typed in the search area: Planet Earth

Search area computed. Searching the Planet Earth.

Slowly, continent by continent, the machine searched the planet, looking for the person with the same genetic strands of DNA as Isabella did. Finally, the machine finished and gave a printed version of the results.

Only one line was actually printed on the page.

There are no results for the person: Isabella Garcia-Shapiro found in Planet Earth.

That meant two things:

1) Isabella had left the planet.

2) Somehow she had changed some part of her DNA strand.

Ferb, recognizing defeat, went back into the house to go get some snack to eat for the two of them while Phineas watched the invention disappear and leaned back against the tree, thinking about the previous day.

*flashback*

"Phineas!" Isabella shouted. "Are you even there? Or are you so entranced in your invention that you don't have time for your friends?"

"No, I'm not!" Phineas protested. "I spend a lot of time with my friends, every day... You should know, you come and visit every day."

"Then do you even remember what day it is today?" Isabella asked.

"Um... Thursday?" Phineas asked.

"Ugh! It isn't just another Thursday Phineas!" Isabella practically shouted and stormed out of the backyard.

"Hm... I wonder what got her in a bad mood," Phineas responded... Preparing to go rush out after her and try to calm her down. Buford and Ferb held him back. "What? Do YOU guys know why she's mad?"

"Its your friendship anniversary with her Dinner Bell..." Buford replied.

Ferb nodded. "You forgot this year..."

"No... I didn't forget... I just thought that it was next week... That's what I put down on my calender..." Phineas protested...

Ferb shook his head. "It was today..."

*end flashback*

Phineas sighed... If he would forget in the past, then she would playfully remind him after tricking him to do something that would remind him... This time, she had just stormed out...

He had assumed that she would get over it... If he had known that she would've run away, then he would've gone over to her house, and reassured her that he valued her more than his inventions...

Then Ferb came out holding two glasses of lemonade and gave one to Phineas, who took it without another word.

"Ferb, I know what I should do... But I don't even know where to look for her..." Phineas couldn't concentrate on anything else.

"Chrysanthemum flowers grew naturally in China before they were brought to Europe and the rest of the world... Maybe you should start in China and see if you can't find any glimpse of her there..." Ferb explained.

"I would, if school didn't start up again tomorrow..." Phineas said dejectedly

"That's why I was working on this," Ferb responded, pointing to a robot that was coming out of the garage. The machine was an exact replica of Phineas.

Cautiously, Phineas got up and inspected it. It was exactly him, down to how the skin felt and the heartbeat.

"It is a replica of you, it has your personality and knowledge of the world..." Ferb explained. "It can fool mum, dad, Candace, and everybody at school while you chase after Isabella."

Phineas looked over at his step-brother. "You are willing to lie to everybody to give me a chance to make it right with Isabella?"

Ferb nodded.

"Thanks Ferb," Phineas replied before pressing a button on a remote control and a few assorted things that Phineas might need came up on a table that rose from the ground.

- A Cloak
- A Watch
- A Radio Earpiece
- A Backpack
- A Pair of Sunglasses
- A Pair of Gloves
- A Pair of Boots

Everything Phineas needed: food, water, his sketchbook, money, and a tracking device were in his backpack. Phineas stuffed everything in the backpack (making great use of space), and managed to fit it all in, put on the boots, watch, and sunglasses and finally put the backpack on.

"You don't know how much this means to me Ferb," Phineas said before hugging his brother. "With any luck, I'll be back here before you know it..."

"Good Luck and God Speed..." Ferb replied, hugging him back.

"Now who says that anymore?" Phineas asked grinning before running out the backyard gate and into the sunset, chasing after the girl he sought so desperately.