From publisher blurb:
The people of the 13th century were living in an agricultural society, they relied on vast quantities of grain. To get their grain they had to be in tune with the season, ploughing, planting, growing, harvest all relied on the knowledge of the seasons.
They believed that the seasons were controlled by forces, some thought that the winds and the sun were gods, who slept or woke - became loving or angry with the change of the seasons. There is also a fey version of this story regarding the mating of the Willow Maiden and the Mistletoe King.
The adventure asks the question, what would happen if the king never finds the Willow Maiden? What would happen if he were to be accosted and never came to settle? Then, winter would never come, it would be forever autumn.
After the ploughing the winter frost needs to break up the ground, release the nutrients. The animals would never get to spring and mate, fish would die in the lakes and rivers, the weather would turn the paths and tracks to deep mud. In short the kingdom would be in chaos.