Great! Here's **Chapter 3: The Lost Cup** in its full, expansive novel form: ---

 

## **Chapter 3: The Lost Cup**

The morning at the primary school on Wierzbowa Street started out as an ordinary one: children running into the hallways, the sound of the bell, the smell of paint in the classrooms, and old maps in the display case. However, that day, the principal was clearly worried. A valuable sports cup, which was supposed to be displayed in the city exhibition, had gone missing.

"Commissioner Nowak!" the principal called as Jakub entered the school with Argo. "It's a special cup... and we can't find it!"

Jakub nodded, patting Argo's head.

"Relax, Principal. Nothing will escape Argo and me. Show me the place where the cup was last seen."

---

### **First Clues**

The dog immediately began sniffing the gymnasium, its nose leading it from the floor, through the lockers, and all the way to the locker room. Each step was cautious, and its paws tapped softly on the wooden floor.

"Argo, what do you see?" asked Jakub, observing the dog.

Argo walked to one corner of the locker room, barked low, and placed his head against the floor, sniffing intently. The commissioner knelt down, examining it closely. In the corner lay a piece of paper with a note from a student: "Don't worry, it's a surprise for the team."

"What a youthful fantasy," Jakub muttered, smiling. "But we have to find the cup before someone accidentally damages it."

--

### **The Trail Continues**

Argo headed toward the school basement. His instincts were right—the dog could smell the metal and wood that might indicate its hiding place. Jakub carefully followed him, holding a flashlight in one hand and the handcuffs and notebook in the other.

In the basement, he found an old sports equipment closet. The door was slightly ajar. Argo raised his head and barked softly. The commissioner smiled faintly:

"I guess you're close to the truth, Argo."

He opened the door and... there, among the old balls and gymnastics mats, lay the trophy, gleaming in the flashlight's beam.

"Excellent!" Jacob sighed. "So our 'thief' was just the good spirit of the student team."

--

### **Solution to the Puzzle and Lesson**

After a brief explanation with the principal and teachers, Jakub returned the trophy to the display case, ensuring the students wouldn't be severely punished.

"Argo, you know what?" the commissioner said, petting the dog's head. "This puzzle wasn't dramatic, but it showed one thing: sometimes even the simplest investigations require patience, observation, and cooperation."

The dog sat down next to him, barking softly as if saying, "I'm always ready."

--

### **Reflection After the Case**

As he left school, Jakub looked at the children playing and felt a sense of relief. The world didn't always put them in danger of death—sometimes, solving a simple, everyday puzzle was enough.

"But I know one thing, Argo," the commissioner murmured, looking at the dog. "Every case, big or small, teaches us something new. And thanks to you, we always have an advantage."

The dog raised his head, his eyes sparkling in the morning sun. Jakub knew that, no matter the difficulties, together he and Argo were unbeatable in any puzzle that arose in their town.

--

This chapter fully develops the mini-adventure with the cup in schools, adding descriptions of the setting, characters, suspense, action, and reflection, while emphasizing Argo's role as Jakub's partner.

I can now write **Chapter 4: The Mystery of the Nightwalks**, also in full, comprehensive novel form.

Would you like me to continue Chapter 4?