Spit the detective llama (AVI-M4)

An officer is walking through the neighborhood. He is holding a large dog. The animal pulls on the leash and barks. That cop must be looking for a crook, Finn thinks. “I want to do that too,” Finn says. “I want to teach Spit to be a sniffer dog.” “Sleuth llama, you mean,” says Dad. Will Finn be able to get his llama to investigate? And what will Spit find?