The Castle starts just after the men of a town have returned from fighting in one of the crusades.
It would appear from their reactions that none of them expected much to have changed whilst they were away however they are shocked or even appalled to discover just what the women got up to when their backs were turned, most notably the abolition of the church and the lack of social status, the men clearly are not used to everyone being equal in the way that the women now are.
Krak, a prisoner who was brought back by the crusaders, has the idea that the men must build a castle in order to reinstate their authority over the women or at least that's what he told them in reality he is planning the castle to destroy the women.
Krak doesn't see the castle in the same way as the men do they see it as a defence Krak sees it as a weapon especially when the neighbouring towns build their own castles bigger and better than the castle being build by the crusaders.
Meanwhile there are several complicated relationships going on between some of our characters.
First there is the marriage between Stuckly and Ann, Stuckly is clearly still in love with his wife as he has emphasised from the start that he has saved himself for her
However whilst the men were away the women started their own all female commune where they only use they have men is to have children by and this is just what the men who stayed behind were used for.
Because of the general lack of men and their new way of life the women started lesbian relationships with each other. One of which is between Ann and Skinner, Stuckly cannot understand this...