Separate premise from payoff
Readers usually want enough information to decide whether a book interests them, but not the revelations that make the reading experience unfold. That line moves by genre, yet the basic principle is simple: early setup is fair game, major turns are not.
When you are unsure, describe what the book is exploring rather than what it eventually reveals.
- Stick to jacket-copy territory for general recommendations.
- If a twist changes the meaning of earlier scenes, treat it as a spoiler even if it arrives before the halfway point.
- Use theme, tone, and craft observations to recommend without overexplaining.