以下是一個偵探英文故事：
The Mystery of the Missing Millionaire
Once upon a time, in a small town, there was a wealthy millionaire named Mr. Smith. He had recently retired and was enjoying his days at home, relaxing and taking care of his affairs. One day, he disappeared without a trace.
The police were called in to investigate, but they couldn't find any clues. They interviewed his family and friends, but no one had any idea why he would leave without a word. The only thing they knew for sure was that he had left his mansion with a suitcase and a few personal belongings, and had never been seen again.
Enter our protagonist, a brilliant young detective named John Watson. He was hired by Mr. Smith's family to solve the mystery of his disappearance. Watson quickly realized that there was something strange about the case. There were no signs of a break-in or robbery, and there were no debts or issues with the bank. Mr. Smith seemed to just vanish into thin air.
Watson began to investigate and soon discovered that Mr. Smith had an old enemy in town named Mr. Harris. Harris had been trying to get revenge on Smith for years, but he always seemed to come up short. Watson thought that maybe Harris had something to do with Smith's disappearance.
So he went to interview Harris, but Harris denied any involvement. He claimed that he had been away on business all week and couldn't have possibly known anything about Smith's disappearance. Watson didn't believe him, but he didn't have any evidence to prove him wrong either.
As Watson continued to investigate, he discovered that Mr. Smith had left behind a hidden message in his will. It stated that he had planned to reveal the truth about himself and his family to the town on his return. This made sense to Watson because it meant that he was not really gone at all.
After tracing Mr. Smith's true destination, Watson found him sitting on a park bench, lost in thought and having some peace after his disappearance ordeal. The millionaire revealed that he had been playing a prank on his family and friends, which is why he left without a trace. He explained that he wanted to take a break from his life and enjoy some quiet time before returning to his old life as a wealthy millionaire.
The mystery was solved and everyone was happy to have their beloved millionaire back home safe and sound. John Watson solved the case with his brilliant detective skills and became a hero in the town for bringing back their beloved millionaire.