That highly depends on the story. There are some stories which rely on surprising the reader in a delightful way. If that's revealed in the description it'll t

That highly depends on the story. There are some stories which rely on surprising the reader in a delightful way. If that's revealed in the description it'll take away something really important. I've seen that many times. It makes reading the part up to then look very different, and more boring. In fact I don't like to read anything where it's clear where it's going, it doesn't have to be because it's revealed in the blurb, it can as well be because of the author's writing. In contrast, for non-fiction a good summary is perfectly fine.