After having purchased Skåne, King Magnus is keen to continue expanding the Swedish territories, but so is King Valdemar in Denmark. The two lock horns over control of land around the Baltic Sea. There is trouble brewing on the island of Gotland, and over in Danish-controlled Estonia, the local population is rising up. Back home King Magnus wants to ensure the line of succession is secured and make sure that there were laws in place to keep the people fighting for him in line.
At the end of the episode we see how news of a devastating disease arrives from the European continent. Once it reaches Sweden, it will change the course of the country's history.