The epic narrative centers on the rebellion of Satan against God and the subsequent temptation of Adam and Eve in the Garden of Eden. The poem follows the fallen angel Satan as he orchestrates a plot to corrupt humanity, while God observes and maintains the cosmic order. Adam and Eve navigate their existence in paradise, eventually facing the psychological and physical consequences of their disobedience. The narrative is structured as a grand epic poem, utilizing blank verse to convey the scale of the conflict across heaven, hell, and earth.

Readers and critics frequently analyze the work for its complex portrayal of Satan, often debating whether he serves as a sympathetic figure or a cautionary archetype of pride. Discussion often centers on the tension between Milton's theological objectives and the aesthetic power of his verse. Scholars highlight the poem's profound influence on Western literature, noting how it shapes subsequent perceptions of morality and the human condition. The pacing is often described as deliberate and grand, reflecting the epic scope of the subject matter. Many readers find the intellectual density of the language to be a defining feature that requires careful attention to appreciate the nuance of the arguments presented.