This book by Gordon R. Lewis offers a conservative, evangelical perspective on cults. Lewis explores common groups like Mormonism and Jehovah's Witnesses, but his chapter on Seventh Day Adventism is particularly insightful. Evangelicals have long debated Seventh Day Adventism, with some viewing it as acceptable and others considering it cultic due to its views on grace and the Sabbath. Lewis argues that while individuals involved with Seventh Day Adventism can be saved, the group's emphasis on legalism, false doctrine, and Ellen G. White's prophetic authority poses significant dangers. Despite being somewhat dated, this book remains a valuable resource and is recommended.