Charismatic but slightly crooked tour guide Marius makes a living by taking tourists on his panoramic bus. On the day his car breaks down and his small business is in jeopardy, he meets three local kids who claim to have found a mysterious box with clues to a hidden treasure. They turn to Marius for help, because no one knows the city better than he does! In no time, everyone is on a dangerous journey full of adventure, because now they are being hunted by a local gang obsessed with finding a mythical jewel. Mysterious dungeons, ancient riddles and explosive traps await the heroes. This will be an adventure the city will remember for a long time!