When I'm working on a blurb I think of it as the tiny movie trailer for my book — all atmosphere, a single antagonist, and one line you can't stop thinking about. First, write a one-sentence hook that puts the main conflict front and center: who wants what, and what's stopping them. Then add one or two sentences that raise the stakes and hint at the emotional journey; don't try to summarize every subplot. Keep it tight, active, and present-tense. I like to scribble drafts on napkins while waiting for coffee, and the best hooks often start out as a raw, slightly desperate sentence that I trim down later.
Next, show a unique detail or voice. If your book has a quirky mechanic or an unexpected setting, let one vivid image do the heavy lifting. Avoid spoilers — the blurb should promise answers, not hand them over. If you can, include a short line of social proof (a star rating, a blurb from a blurber, or a clever comparison like "fans of 'The Hunger Games' will...") without leaning on clichés.
Finally, read it aloud and cut anything that drags. A blurb isn't an outline; it's an invitation. If it makes you want to open the book or pester a friend about it, you've probably got something that sells. Try three radically different hooks and test them on readers — you'll be surprised which one lands.