Detective agency Merlina has four members. The brains and chief is Marie-Ann Meerschaut, called Merlina by her friends. Her codename is "gemini". Her niece Ann De Schrandere is a detective at the agency. Her codename is "sagittarius". Polycarpus Fernandus Augustus 'Pol' Tack is a detective as well - Kind of - His codename is "aquarius". Last but not least: Napoleon, the genius who created a lot of inventions to assist the team in their missions. His codename is "libra". Together they fight crime and injustice. No mystery remains unraveled for the best detective agency in the country.