A mundane suburbanite declares himself the Second Coming of Christ and gathers a band of unlikely followers for a pilgrimage to Austin. Harold Peeks, a middle-aged man adrift in a life of quiet desperation, finds unexpected purpose when he announces his divine identity at an office party. Driven by a newfound conviction, he embarks on a two-hundred-mile walk, accompanied by a motley crew of disciples who see in him a savior. The narrative, told from the perspective of Harold's friend Blake Waterson, explores the absurdity and sincerity of this modern messianic movement unfolding against the backdrop of suburban ennui and the open road.

The Book of Harold is characterized by its audacious premise and its ability to balance profound commentary with wild humor. Reviewers have noted its masterful satire of contemporary messianic movements and suburban life, appreciating the complex portrayal of its titular character. The novel is recognized for its unique voice, blending deep respect for spiritual themes with an irreverent, often hilarious, take on belief. Its narrative structure, employing a close friend as narrator, allows for an intimate yet critical examination of Harold's extraordinary claims and his followers' devotion.