Psychographed by Francisco Cândido Xavier and Waldo Vieira, Evolution in Two Worlds is divided into two parts. The first connects words of Christ to concepts such as the existence of the perispirit and spiritual body, the cosmic fluid, heredity, evolution and sex, nourishment in the spirit realm, and the mechanics of the mind, among others. The second part combines questions and answers related to marriage, divorce, pregnancy and abortion. The Spirit André Luiz combines scientific and evangelical concepts to promote a study of the evolutionary process of the being and the soul in the two realms of our existence - the material world and the spirit world - establishing an intellectual challenge to all those who practice and wish to know the Spiritist Doctrine.