The damp, rain-scented street stretched out under the golden light of lanterns. It was a deafening night in the City of Mirrors, where people had long since fled to their homes, and life was only just beginning to loom in the alleys. Across the rooftops, deftly leaping from one to the next, ran a young fox with red fur - Leo. He was just learning how to become a true Guardian of the Night, just like his father and grandfather. He had only one rule: not to trust anyone completely, because under the cover of darkness every animal could hide its secrets. That evening, while Leo was patrolling his part of the neighbourhood, he noticed something strange. On the wall of an abandoned warehouse, someone had scrawled a mark in the shape of a gaping eye with shiny, silvery paint. He had never seen anything like it before. Suddenly, a quiet, shuffling silhouette slid out from around the corner - it was a rat named Viki, known in the neighbourhood for delivering messages. Viki looked at Leon nervously and whispered: "Don't look too long at that sign. They say it's a call to..." - he paused, hearing a sudden murmuring. Leo felt his fur stand up. Two shining dots emerged from the darkness, and quiet whispered voices began to echo around him. Were they animals, or something else? Leo reflexively took a step back, ready to flee, but at the same time filled with curiosity. Suddenly, a mysterious shadow approached the sign on the wall, touched it with its paw and....