The poem narrates a pilgrim's imaginative voyage through three successive realms of the afterlife: a descent into a structured Hell, an ascent through purgatorial purification, and a culminating journey into the celestial spheres. Guided first by a classical poet and later by a beloved figure who represents divine grace, the narrator meets many souls whose punishments, penances, and beatitudes exemplify moral lessons. Using vivid allegory, symbolic encounters, and theological reflection, the work examines sin, repentance, divine justice, and the human capacity for transformation. Its tripartite form interweaves narrative episodes with philosophical and spiritual meditation.