The purpose of the present work is to evidence Grace Ogot's The promised Land as a novel of disillusionment. The exploration of the novel of our corpus reveals that Ochola the main character resorts to migration as the only alternative to the difficulties of life he experiences in the land of Seme in Kenya. This departure, based on some motivations, namely poverty, influence of the social environment, and his obsession for wealth, has paved the way to his long and mysterious disease preceding his empty-handed return to Kenya.The exploration of this novel has enabled us, to set the relationship between the writer's art and his social engagement. Then, thanks to some appropriate literary devices used, by the latter such as paratext, narrative techniques and style.