The next day, Casper woke up feeling excited. He couldn't wait to explore more of the mansion with his new friends. As he floated down the grand staircase, he saw the treasure hunters waiting for him in the foyer.

"Good morning, Casper!" they greeted him with big smiles.

"Good morning!" Casper replied, returning their smiles.

The treasure hunters had a surprise for Casper. They had brought him a new book to read. It was a story about a friendly ghost who lived in a mansion just like Casper. Casper was thrilled and thanked them for the thoughtful gift.

As they sat down to read the book, Casper noticed that there were some words he didn't understand. He asked the treasure hunters for help, and they happily explained the meanings to him. Casper was determined to learn these new words so he could understand the story better.

After finishing the book, the treasure hunters suggested they play a game of hide-and-seek in the mansion. Casper agreed, and they all had a blast searching for each other in the many rooms and secret passages.

As they were playing, Casper remembered something. He had seen a locked door in the mansion that he had never been able to open. He told the treasure hunters about it, and they were intrigued. They decided to make it their mission to find the key and unlock the door.

After searching high and low, they finally found the key hidden in a secret compartment in the library. Excitedly, they unlocked the door and discovered a room filled with old paintings and artifacts. Casper recognized some of the paintings as his own family members who had lived in the mansion long ago.

The treasure hunters were amazed by the history and stories behind each painting. They thanked Casper for showing them this hidden room and promised to help him restore the paintings and preserve the history of the mansion.

Casper was touched by their kindness and felt grateful to have such wonderful friends. Together, they spent the rest of the day cleaning and restoring the paintings, and learning more about the history of the mansion.

As the sun began to set, the treasure hunters bid farewell to Casper, promising to come back and visit soon. Casper watched them leave with a smile on his face, knowing that he had found true friends in these treasure hunters. And he couldn't wait for their next adventure together.