1Jack couldn’t sleep.

2He put his glasses on. He looked at the clock. 5:30.

3Too early to get up.

4Yesterday so many strange things had happened. Now he was trying to figure them out.

5He turned on the light. He picked up his notebook. He looked at the list he’d made before going to bed.

6Jack pushed his glasses into place. Who was going to believe any of this?

7Not his mom. Or his dad. Or his third-grade teacher, Ms. Watkins.

8Only his seven-year-old sister, Annie. She’d gone with him to the time of the dinosaurs.

9“Can’t you sleep?”

10It was Annie, standing in his doorway.

11“Nope,” said Jack.

12“Me neither,” said Annie. “What are you doing?” She walked over to Jack and looked at his notebook. She read the list.

13“Aren’t you going to write about the gold medal?” she asked.

14“You mean the gold medallion,” said Jack.

15He picked up his pencil and wrote:

16“Aren’t you going to put the letter M on the medal?” said Annie.

17“Medallion,” said Jack. “Not medal.”

18He added an M:

19“Aren’t you going to write about the magic person?” said Annie.

20“We don’t know for sure if there is a magic person,” said Jack.

21“Well, someone built the tree house in the woods. Someone put the books in it. Someone lost a gold medal in dinosaur time.” “Medallion!” said Jack for the third time. “And I’m just writing the facts. The stuff we know for sure.”

22“Let’s go back to the tree house right now,” said Annie. “And find out if the magic person is a fact.”

23“Are you nuts?” said Jack. “The sun’s not even up yet.” “Come on,” said Annie. “Maybe we can catch them sleeping.” “I don’t think we should,” said Jack. He was worried. What if the “magic person” was mean? What if he or she didn’t want kids to know about the tree house?

24“Well, I’m going,” said Annie.

25Jack looked out his window at the dark-gray sky. It was almost dawn.

26He sighed. “Okay. Let’s get dressed. I’ll meet you at the back door.

27Be quiet. ”

28“Yay!” whispered Annie. She tiptoed away as quietly as a mouse.

29Jack put on jeans, a warm sweatshirt, and sneakers. He tossed his notebook and pencil in his backpack.

30He crept downstairs.

31Annie was waiting by the back door. She shined a flashlight in Jack’s face. “Ta-da! A magic wand!” she said.

32“Shhh! Don’t wake up Mom and Dad,” whispered Jack. “And turn that flashlight off. We don’t want anyone to see us.” Annie nodded and turned it off. Then she clipped it onto her belt.

33They slipped out the door into the cool early-morning air. Crickets were chirping. The dog next door barked.

34“Quiet, Henry!” whispered Annie.

35Henry stopped barking. Animals always seemed to do what Annie said.

36“Let’s run!” said Jack.

37They dashed across the dark, wet lawn and didn’t stop until they reached the woods.

38“We need the flashlight now,” said Jack.

39Annie took it off her belt and switched it on.

40Step by step, she and Jack walked between the trees. Jack held his breath. The dark woods were scary.

41“Gotcha!” said Annie, shining the flashlight in Jack’s face.

42Jack jumped back. Then he frowned.

43“Cut it out!” he said.

44“I scared you,” said Annie.

45Jack glared at her.

46“Stop pretending!” he whispered. “This is serious.” “Okay, okay.”

47Annie shined her flashlight over the tops of the trees.

48“Now what are you doing?” said Jack.

49“Looking for the tree house!”

50The light stopped moving.

51There it was. The mysterious tree house. At the top of the tallest tree in the woods.

52Annie shined her light at the tree house, and then down the tall ladder. All the way to the ground.

53“I’m going up,” she said. She gripped the flashlight and began to climb.

54“Wait!” Jack called.

55What if someone was in the tree house?

56“Annie! Come back!”

57But she was gone. The light disappeared. Jack was alone in the dark.