Sam Savage's 'Firmin: Adventures of a Metropolitan Lowlife' introduces readers to Firmin, a highly intelligent and existential rat born in the basement of a Boston bookstore. Firmin's unusual diet consists of books, which he devours not merely for sustenance but for the knowledge and stories within. Through his unique perspective, Firmin offers a poignant and humorous commentary on human nature, literature, and the bittersweet solitude of an intellectual outsider. His journey is one of discovery, longing, and a deep, if unconventional, love for the written word, making this a truly memorable and thought-provoking read about a most unlikely protagonist.