Great! Here's **Chapter 16: The Mystery of the Old Library** in its full, expansive novel form: ---

## **Chapter 16: The Mystery of the Old Library**

The old library on the corner of Wiśniowa Street has attracted book and history lovers for years. Its tall, dusty shelves held decades-old volumes, and its narrow corridors and creaking stairs gave the place a somewhat mysterious feel. Recently, however, strange things began to happen in the library: books appeared in places other than where they should have, and at night, you could hear the faint tapping and rustling of pages being turned by an invisible hand.

"Commissioner Nowak!" called the librarian, Mrs. Teresa, as Jakub and Argo entered the building. "Someone must be walking around here at night! I'm afraid the books are going missing or someone is trying to steal them."

Jacob, petting Argo on the head, immediately felt that the case required observation and patient tracking:

"Argo, it's time to solve another mystery. The library holds a secret we must uncover."

The dog lifted his head, sniffed the air, and moved deeper into the rooms.

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### **First Clues**

The library corridors were dark and dusty. Argo stopped at a shelf of children's literature, sniffed the underside of the shelf, and barked softly, leading Jacob towards an old, dusty warehouse.

"I see you're sensing something here, Argo," Jacob murmured, following the dog. "Show me what's behind that rustling."

The dog sniffed carefully, and his nostrils picked up a mixture of paper, dust, and… the faint aroma of tea. The scent led towards a small window in the warehouse.

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### **Building the Suspense**

In the storeroom, Jakub noticed overturned books and abandoned notes. Suddenly, Argo barked louder and pointed his nose to the corner of the room. In the darkness, they spotted a boy hiding behind a shelf, reading old volumes about the city's history.

"Easy, young man," Jakub said, "you're not stealing, are you?"

The boy admitted that he came to the library at night to read the books that interested him most in peace. He didn't want to disturb the librarian or raise an alarm.

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### **Solving the Puzzle**

Jakub calmly spoke with the boy and the librarian. Together, they agreed that the boy could visit the library after hours, under supervision or as part of a special program for young readers. Argo sniffed a few more shelves, making sure everything was in order.

"You see, Argo," said Jacob, petting the dog's head, "not every puzzle requires a chase or dramatic action. Sometimes, observation and understanding the needs of others are enough."

The dog sat at his leg, gazing into the commissioner's eyes with devotion and readiness for another adventure.

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### **Reflection after the adventure**

The library returned to peace, and the boy could continue his nightly reading safely. Jacob knew that Argo and he could solve any puzzle—both dangerous and those filled with mystery and emotion.

"Job well done, Argo," Jacob murmured. "The city can sleep soundly, and the books remain in their places."

The dog raised his head, ready for another mini-adventure, and Jacob knew that each subsequent puzzle would be another lesson in patience and observation.

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This chapter expands on the mini-adventure in the old library, introducing elements of suspense, mystery, and an educational message. Argo demonstrates his exceptional tracking skills, and Jacob wisely resolves the situation, teaching young readers the principles of safety and cooperation.

Now I can continue with **Chapter 17: Disappearing Animals at the Zoo** or the next mini-adventure on your list.

Want me to write Chapter 17?