Stars in the castle gets five famous Swedes who have been living together for five days in the castle. Each will be the main man in one day, and then to determine which five should be and what they should eat together. During the day, the person focused all around the themselves and others, to ask questions about the person's life. The series provides a deeper understanding of the Swedish profile's life that made them who they are today, childhood and career is a constant topic of conversation. Five individuals who are significantly different from each other, creating an interesting dynamic and opens up all sorts of discussions.