Okay kiddo, so a long, long time ago, there was a man named James Smith who decided to sell a man named Arthur Keech a shop lease. That means that Arthur could use the shop for a certain amount of time if he paid James some money.
Arthur did a really good job with the shop and he made a lot of money. But then James died and his will said that the shop lease would go to his nephew, Thomas Sandford.
Now, Thomas didn't like Arthur for some reason, and he kicked him out of the shop before his lease was up. Arthur was really upset because he had put a lot of work into the shop and he didn't want to leave.
So Arthur went to court and said that Thomas shouldn't be able to kick him out because he had already paid for the lease with James. But Thomas said that since he was James' nephew, he had the right to the lease.
The judges had to decide who was right, and they looked at a lot of old rules and laws to make their decision. In the end, they said that even though Arthur had paid for the lease, Thomas had the legal right to it because he was James' nephew.
So Arthur didn't get to keep the shop, but the court case, called Keech v Sandford, helped establish some important legal principles about leases and property rights.