Alex, Roger, Edward, Nadia, Keith and Stephanie are young people from different aspects of life, until one day, by means of a letter they find themselves involved with a certain Mr. Fournier. Fournier holds a meeting in his castle and offers them an interesting proposal. If they accept, the six protagonists will have to work together to solve cases of missing people (hence the title PRN). For this they will be paid generously by Fournier. All six accept the mission and they are immediately given the first case to solve….

Throughout the series, PRN will encounter different cases ranging from kidnap for ransom to satanism, domestic abuse, love, fraud and much more. Each episode guarantees a great deal of action and adventure. One thing links the cases together : our friends will have to use all their wit, talent and abilities to solve their missions and find the missing people. Apart from this danger is the order of the day.