So there’s this old subway tunnel in the city, all concrete and echoes, and the only creature that owns it is a grizzled rat named Milo. He’s got a scar over one eye that makes him look like a tiny detective, and he spends his nights mapping every tunnel and every platform. One night, a kid from the subway school gets stuck after a power outage. The lights are out, the doors are jammed, and the kid can’t see where to go. Milo, hearing the child’s voice through the darkness, starts sniffing the air, following the faint scent of fear. He finds the hidden lever that opens the emergency doors and nudges it with his nose. The doors swing open, the kid runs out, and the whole train crew hurries down, calling Milo the “guardian of the tunnels.” The city starts putting little plaques in the tunnels, thanking a rat for keeping the people safe. It’s like, who knew a rat could be a hero?