Truth is under attack, MacArthur argues, and the attack is going on within the boundaries of evangelicalism rather than only outside them. There is a good deal at stake and no middle ground, no safe zone for the uncommitted. He wrote this book to unveil the tactics involved and to equip the reader to resist them, exposing the pitfalls of postmodern thinking about truth and its effect on the contemporary church.

Jude's letter supplies the framework: a short epistle written to people who expected to write about something more pleasant and found they had to contend for the faith instead. MacArthur traces historic skirmishes in the battle for truth and then turns to the reader's own response. Direct and contested, and clear about the position it argues.