How is Pale Fire structured as a poem with commentary?

Pale Fire (1962) by Vladimir Nabokov is a unique novel structured as a parody of literary scholarship. The work is centered on a 999-line poem written in heroic couplets by a fictional academic named John Shade.12

This poem is presented alongside a critical apparatus—specifically a commentary—written by Shade’s neighbor and colleague, Charles Kinbote. Kinbote, a professor suffering from paranoia and madness, claims to be the exiled king of Zembla. He "edits" the poem by twisting its lines to fit his own delusional history, interpreting Shade's work as a Zemblan epic that references his own life.12

By replacing a traditional linear narrative with this poem-and-commentary structure, Nabokov challenges the reader's conventional approach to fiction. The novel effectively liquidates the traditional sense of direction, forcing the reader to navigate the text through the distorted lens of an unreliable narrator.2