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There was no answer.

"I don't know," said Jack.

"I just feel it," said Annie.

"We'd better find out where we are," said Jack.

Jack's heart pounded with excitement. He could hardly speak. "We've landed inside a moon base," he said.

"Oh, man --" Jack whispered.

"What kind of training place is this?" asked Annie.

The room was round. It had no windows. It had white floors and a curved wall lit by bright lights.

"So the moon base is on the moon!" said Jack.

Jack opened his eyes.

"Hello!" Annie called.

"How do you know?" said Jack.

He looked out the window. The tree house had landed inside a large white room.

He looked at the page in the moon book. He read the words below the picture of the dome. A moon base was built on the moon in the year 2031. The top of the dome slides open to let spacecrafts enter and leave.

Annie's eyes widened. "We're on the moon?" she asked.

"There's nobody here," said Annie.

Where were all the astronauts and space scientists? Jack wondered.

"What's wrong?" said Annie.

"So…?" said Annie.

"Maybe she's nervous about being on the moon," said Annie.

Squeak, squeak!

"I guess," said Jack. He read more: The small base has a landing chamber and a room for storing spacesuits. Air and temperature controls make breathing possible.

"So what's a moon base?" asked Annie.

"Right," said Jack. "And now we're in the future, on the moon."

"Poor Peanut," said Annie.

Jack nodded. "The book says the moon base was built in the year 2031," he said. "So this book was written after that! Which means this book is from the future!"

"Oh, wow," said Annie. "Morgan must have gone forward in time to borrow it from a future library."

"She's not the only one," said Jack. He let out a deep breath, then he pushed his glasses into place.

Jack looked at the book. He read aloud: When scientists visit the moon for short periods, they eat and sleep in the moon base.

Annie and Jack looked at Peanut. The mouse was running around in circles.

"A space motel!" said Annie.

She tried to pick the mouse up. But Peanut hid behind the mango on the letter M.

It showed only one way to go. Jack walked along the curved white wall to the stairs.

Jack looked at his diagram.

"You study it," said Annie.

Jack copied the map. Then he drew in the tree house.

Jack looked back at Peanut. The mouse was running back and forth on the M.

"Stay here and be safe," said Jack. "We'll be back soon."

Jack put the moon book and pencil into his pack. Carrying his notebook and backpack, he started out the window.

Jack looked up. Annie was gone.

"Oh, brother," Jack said. As usual, she had left without him. Before they could even make a plan.

"Let's explore," said Annie. "We have to find the fourth thing for Morgan."

Squeak! Squeak!

"Annie!" he called.

"Okay," he said. He pointed at the X in his drawing. "We're here."

Jack swung himself over the window sill. His feet touched the floor of the landing chamber.

There was no answer.

"No, first we should study this map," said Jack. He pulled out his notebook.

"So that's why we can breathe," Jack said.

He climbed the steps to a hallway.

"Jack -- hurry!" Annie was at the end of the hallway, standing in the airlock. She peered out a window in a giant door.

Jack hurried toward her. Annie stepped aside so he could look out the window, too.

"Oh, man," said Jack. What he saw took his breath away.

"Say hi to the moon," Annie said softly.

He stared at a rocky gray land. The land was filled with giant craters and tall mountains. The sun was shining. But the sky was ink-black!