Book excerpt: In a sweeping review of forty truth commissions, Priscilla Hayner delivers a definitive exploration of the global experience in official truth-seeking after widespread atrocities. When Unspeakable Truths was first published in 2001, it quickly became a classic, helping to define the field of truth commissions and the broader arena of transitional justice. This second edition is fully updated and expanded, covering twenty new commissions formed in the last ten years, analyzing new trends, and offering detailed charts that assess the impact of truth commissions and provide comparative information not previously available. Placing the increasing number of truth commissions within the broader expansion in transitional justice, Unspeakable Truths surveys key developments and new thinking in reparations, international justice, healing from trauma, and other areas. The book challenges many widely-held assumptions, based on hundreds of interviews and a sweeping review of the literature. This book will help to define how these issues are addressed in the future.