A boy is born with a female shadow. He has to be hidden from the light until the phenomenon can be exploited for commercial purposes. After marrying, his wife becomes aware of the female shadow and returns to her father. With the death of the wife ten years later the man marries the shadow, with the children being born divine.
The narrator then explains that certain poets rely upon the feminine for their inspiration because birth requires a man and a woman.
One wonders whether Q’s fiancée and then wife was important to him as a muse. This in part explains his need to marry her, in the face of adverse circumstances, and the creative explosion which followed over the next few years.