Kai walked into the Memory Bank. His hands shook a little. Today was different. Someone had stolen a memory from the vault.
The bank manager, Mrs. Chen, looked worried. "Kai, we need your help," she said. "A very old memory is missing. It belonged to a man from 300 years ago."
Kai nodded. He put on his memory gloves. These special gloves helped him see memory traces. "When did you notice it was gone?" he asked.
"This morning," Mrs. Chen replied. "The memory box was empty. But the lock was not broken."
This was strange. Only a skilled Memory Merchant could open the locks without breaking them. Kai walked to the empty memory box. He touched it with his gloves.
Sudenly, images flashed in his mind. He saw a person in black clothes. The person moved very fast. They knew exactly where to find the memory.
"I can track them," Kai said. "But it will be dangerous. This thief knows memory magic very well."
Mrs. Chen looked scared. "Please be careful, Kai. That memory contains secrets about the old world. If the wrong person uses it, bad things might happen."
Kai left the bank. He followed the memory trail through the city streets. The trail glowed blue in his special vision. It led him to the old part of town where few people lived.
The trail stopped at an old building. Kai took a deep breath. Inside this building, someone was waiting for him. Someone who might be very dangerous.
He pushed open the door and stepped inside.