Chapter 1

The Flynn-Fletcher family had just come back from the vet's office with their pet platypus, Perry.

"Okay, kids. I'm going to drop you off at the house while I go to the gym for a while. Don't forget to give Perry his medicine. The poor thing," said Linda Flynn.

Perry coughed a little. His eyes were droopy and his whole body pale. Phineas stroked the platypus's fur.

They drove past a big billboard that read, "It's Christmas in July! Come on down to the Danville Department store for great deals".

"Hey, Mom," Phineas started. "I didn't know it was Christmas in July. That's so cool! How come we never celebrated it?"

Candace turned around in the front seat to look at her brother.

"There's no such holiday as Christmas in July. Duh! It's just a lame sales gimmick to get you to come in and buy the people's stuff."

"That's too bad. Christmas in July would be a great holiday. Why, Christmas is already a popular holiday. And summer is already a popular season. If someone combined the two, It would be one of the best day ever! That's it!" Phineas cried and turned to his step-brother, Ferb.

"I know what we're going to do today!"

Ms. Flynn dropped everyone off at the house and she took off. Candace looked at her brothers.

"Don't tell me you're going to make up a holiday called Christmas in July," she grumbled.

"Okay then. We won't," Phineas said innocently. He and Ferb walked to the backyard.

Candace yelped, "Ah-ha! I knew it. You are going to make a Christmas in July a real holiday. Well, I guess you can't do anything really insane this time."

Candace walked into the house. She popped her head out the door and teased, "Merry Christmas, guys."

Phineas took out Perry's medicine.

"Okay Perry, time for your- hey, where's Perry? Poor little guy. It's not a good idea to be disappearing when you're sick now is it?"

Perry wandered over to the back of the house. He really didn't feel like going to work today, but he had to. He put his hat on in what seemed like slow-motion and he more like fell into the tunnel to get to the headquarters.

Perry toppled into the chair. Major Monogram's picture appeared on the giant monitor in front of him.

"Agent P! Oh… You don't look so good. What's up?" Monogram said.

Perry let out a strange groaning noise and just waved his hand motioning to continue while he blew his bill.

"Um. Okay. Anywho, Doofenshmirtz is doing something terrible and you need to get to the bottom of it."

Perry put up a hand and shook his head.

"But we need you today! Unless you have a doctor's note, you have to go on the mission," Monogram explained. Perry warily got on to his scooter and left.

"Aw. What a trooper. Why can't all our agents be like that?" Major Monogram said.

Back at the house, Phineas and Ferb were making their plans for their new holiday project.

"So we've decided to make a huge Christmas tree. It should provide shade for the July part and ornaments for the Christmas part. I also think that she should have a Christmas picnic and gift exchange," Phineas said to Ferb. Ferb nodded in agreement. Just then, their neighbor, Isabella peeked around the fence at them.

"Hi, boys. What cha' doin'?" she said sweetly.

"We're celebrating Christmas in July. Wanna help?"

"Sure. But isn't it a little early in the year for Christmas?" Isabella responded.

"Why, no. No it's not," Phineas answered.

"And isn't Christmas in July just one of those lame sale gimmicks to get you to come in and buy people's stuff?" Isabella asked.

"Why, yes. Yes it is," Ferb said.

Isabella blinked and said, "Oh. Well, I'd love to help. My troop will help us also. We should also invite Baljeet and Buford."

Phineas smiled and replied, "Great. The more the merrier!"