In this paper, we present the concept, prototype design and implementation of Zapzap, a table-top device that shows the rough contents of a book placed on it. Zapzap is expected to be deployed in bookstores to support customers browsing books. When the user places a book on the display, the system shows keywords, i.e., words often included in the book. When the user taps one of the displayed words, a sentence that includes the selected word is shown. Zapzap aims to present the atmosphere of a book without spoiling its story.