In the introduction of the book there are some definitions about the terms such as Patterns, Enterprise Applications, and Architecture etc. The features of Enterprise software, and how they differ from other types of software are described in detail.
After the introduction, there are two main sections. The Narratives, and Patterns. The first section is a short tutorial on developing enterprise applications. The next section, is a detailed reference to the patterns themselves.
At the moment, I finished reading the Introduction and willing to start reading the first section.