"The Zealot and the Emancipator: John Brown, Abraham Lincoln, and the Struggle for American Freedom" by H.W. Brands is a 464-page hardcover book published by Knopf Doubleday Publishing Group in 2020. This historical biography explores the lives of John Brown and Abraham Lincoln in the context of the 19th-century American struggle for freedom, focusing on themes of slavery, the Civil War, and the presidency. The book features illustrations and delves into the social and political climates of the time, making it a valuable addition to the genres of biography, history, and social science.