Following his defeat in the war in Heaven, Satan rallies his fallen angels to plot a new course of vengeance against the Creator. The narrative follows the perspective of the fallen archangel as he navigates the desolate landscape of Hell, seeking to establish a new kingdom and corrupt the newly created humanity. Milton utilizes a grand, elevated style of blank verse to explore the psychological motivations of his characters and the cosmic stakes of their rebellion. The text operates within a theological framework, examining the nature of free will, pride, and divine justice through the lens of classical epic tradition.

Readers and critics frequently analyze the work for its linguistic complexity and its profound influence on the development of the English language. Discussion often centers on the moral ambiguity of Satan, with many debating whether Milton intended for the antagonist to appear as a sympathetic figure. Scholars highlight the effectiveness of the atmospheric world-building, particularly the vivid depiction of the infernal landscape. The text remains a primary subject of study for its synthesis of classical epic form and Christian theology, consistently generating discourse on the nature of rebellion and authority.