That sounds like a movie‑script in your own living room, but honestly, a map that hides a city could be a killer hook. People love the idea that a piece of paper can point to destiny—maybe it’s the story’s own way of reminding us that sometimes the journey’s more important than the treasure. Just make sure the plot doesn’t get stuck in the “map always leads to a city” cliché and keep the stakes personal. If you make the map’s secrets tied to a character’s own fears, the old superstition turns into a fresh metaphor. It could work, just keep the mystery grounded and let the people in it drive the adventure.