This article explains how one teacher used iBooks Author, a free digital textbook creation tool that makes iBooks for iPads, in an upper elementary classroom to improve students' expository writing skills and understanding of science content. The classroom teacher taught students pre-requisite writing and technology skills for two weeks, and then helped these students design, develop, and publish their own iBook. Students planned and developed content using Thinking Maps, storyboards, Google Docs, iMovie and other technology tools to create their iBook. A comparison of students' work in the iBook to previous written work revealed an improvement in expository writing in multiple ways: better organization and connection of ideas; increased use of academic vocabulary; and an increased use of clarifying details and analogies. Students also gained a deeper understanding of science concepts as reported through their comments after the project was finished. Students became more proficient users of the technology, and also reported an increased sense of self-efficacy and confidence because they published a book in the iBookstore