The book explores the biblical commandment "Thou shalt not kill," contrasting its implications with instances of sanctioned killings in the Bible. It begins by explaining the commandment's foundational role in God's moral law, emphasizing the sanctity of human life. The Old Testament records instances where God commanded the destruction of specific groups, such as the Canaanites, Amalekites, and Midianites, highlighting theological and covenantal contexts for these judgments.

The book addresses internal judgments within Israel, including the execution of idolaters and other severe penalties under the Mosaic Law. The shift from Old Testament theocracy to the New Testament's spiritual kingdom redefines these principles for modern believers, urging spiritual, not physical, combat against evil while upholding the sanctity of life and trusting God's ultimate justice.

Further, key Old Testament killings are examined, from Cain's murder of Abel in Genesis to Jehu's purge in Israel, each revealing lessons about human sin, divine justice, and moral accountability. The New Testament killings, such as the massacre of the innocents and the stoning of Stephen, reflect a transition in God's redemptive plan and the emerging persecution of the early church.

Central to the book is the murder of Jesus Christ, a pivotal event viewed as both the ultimate injustice and the foundation of salvation. The crucifixion demonstrates God's love and justice, offering profound lessons for believers on sacrifice, forgiveness, and hope.

The book further goes on to discuss, that the martyrdom of the apostles exemplifies unwavering faith and commitment to spreading the gospel, often at the cost of their lives. Their deaths inspire believers to remain steadfast in their faith.