Shining a Light on the Powers of Darkness.

What does the Bible say about demons? Are they real?

What people believed about evil spiritual forces in biblical times was very different from today—an ancient worldview missing in modern analysis.

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In Demons, Michael Heiser debunks popular presuppositions about the true powers of darkness. Rather than speculation, it’s grounded in what people of both the Old and New Testament eras believed about evil forces and what the Bible actually says. Gain a biblical understanding of demons, supernatural rebellion, evil spirits, and spiritual warfare.


“Michael Heiser has done a great service to all who want to understand the biblical theology of demons, the supernatural powers in rebellion against God.”

Gerry Breshears

Professor of Theology, Western Seminary, Portland

“Get ready for many lightbulb moments, and for a whole new appreciation of biblical texts you thought you already understood. This book is highly recommended!”

Tim Mackie

Cocreator of BibleProject

“Dr. Michael Heiser is a master guide into the unseen realm of angels and demons. His newest book will challenge you to rethink many of your common assumptions.”

Dr. Michael Brown

Host of the Line of Fire radio broadcast, president of FIRE School of Ministry, and author of Jezebel’s War with America

“Is it right to say that you love a book about demons? If so, I love this book about demons! Dr. Michael Heiser brilliantly unveils more of the unseen realm.”

Dr. Frank Turek

CrossExamined.org and coauthor, I Don’t Have Enough Faith to be an Atheist


How much do you really know about demons?

Test your Bible knowledge against popular opinion.

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Michael Heiser

Michael Heiser

Michael Heiser (PhD, University of Wisconsin-Madison) is scholar-in-residence at Faithlife.

An expert in Bible and ancient Semitic languages, he is the author of several books including Reversing Hermon and the best-seller The Unseen Realm.

His varied academic background enables him to operate in the realm of critical scholarship and the wider Christian community. His experience in teaching at the undergraduate level and writing for the layperson both directly contribute to the goal of adapting scholarly tools for nonspecialists.

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