That's a request for all readers and all books by any author.
Reviews are so important for an Indie author. Aside from letting other readers know how you felt about the book, it creates a benchmark for advertising.
There are some advertisers that use the number of reviews as a cutoff point. Since they are inundated daily with authors signing up their books, they need a simple rule of thumb to cut down on the sludge. My mysteries are well liked, but lack reviews, so they aren't admissible. As a result, I can't use a lot of the better advertisers. So they don't get a lot of notice.
So if you like a book, leave a review. It's important!