It is divided into five books: the first directed against those who deny the divinity of Jesus; the second against "heretics"; the third against the Jews; the fourth, against Muslims; the fifth gives instructions on the battle against the devil. In this last book Alonso dwells at length upon the demons and their hatred of men; the powers they have over men and the diminution of these powers, owing to the victory of Christ on the Cross, the final condition of the demons, and so on.
It is divided into five volumes: the first targeting those who reject Jesus' divinity; the second against 'heretics'; the third against the Jews; the fourth, against Muslims; the fifth provides guidance on combating evil.