RJ Spencer is a lucky 12-year-old. He lives in the big city and his parents are landlords of the high-rise apartment building that is his home.
The many tenants in the building, along with the endless possibilities of adventures in the city itself, are the perfect setting for the young detective as he sets out to solve every case he can get his hands on.
Someone is not obeying the local rule of cleaning up after their pets and RJ and Joey keep finding themselves tracking this smelly mess around behind them. They are determined to solve this mystery and find the guilty party.