The Book of Vayikra differs from the other Books of the Torah in that most of it contains no narrative or moral exhortation, but rather pure halakha.  Only twice in the Sefer do narratives appear, breaking the continuity of the laws. The multiplicity of details sometimes leads us to a feeling of not being able to see the woods for the trees, and it is therefore instructive to pause for an overview of the Book, divided into clearly defined units, so as to consider its structure and division, and thereby its substance and purpose as well. 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion