How do you write good back blurb?
"Back cover copy is like the packaging on a box of food or the cover of a magazine at the supermarket checkout counter. The vendor has only a few seconds to stop you in your tracks, attract your attention and compel you to make a purchase. You can also consider back cover copy to be similar to a movie trailer or preview: just two minutes that give you the plot line. Based on the trailer, you will decide whether to see the movie, or not. The same holds with your book. Your design/layout, graphics AND verbiage must entice readers and make them hungry for more."
How to Craft Back Cover Copy that Sells Books by the Boatload - The Savvy Book Marketer