This casebook is the first to cover federal habeas corpus comprehensively, presenting post-conviction review and executive detention litigation in an accessible way. It is designed both for standalone courses on habeas corpus, and for courses focusing on post-conviction litigation, wrongful convictions, and national security detention. The first two chapters introduce students to the habeas privilege and the Suspension Clause. A four-chapter unit on post-conviction litigation carefully explores cognizability, procedural doctrines, and merits adjudication. Two chapters develop the role habeas plays in review of immigration and other types of civil detention. A substantial two-chapter unit examines habeas review of national security custody. This revised second edition includes the most recent Supreme Court rulings on federal habeas corpus, summaries of developments on the lower courts, and the latest scholarship.