Chevannes is a well-known contemporary scholar of Rastafari culture. In this book, he presents several different papers and studies he has done, in the form of chapters. What must be noted is that this is not a general book for people who are just getting interested in Rastafari--but rather an advanced text for people already familiar with the basics of this religio-cultural movement---like its myths, symbols, rituals, and so on.
Having said that, the book covers the history and development of Rastafari, from its roots in Myal religion and West African traditions to its development from Revivalism, another religious movement preceding Rastafari. Chevannes also covers Marcus Garvey, early Ethiopianism, and idealizations of "Africa" that inform Rasta ideology. Religious usage of Ganja and Dreadlocks is also covered, providing a helpful correct to racist right-wing myths about the Rasta.
An especially important chapter called "Word, Sound and Power" details the use of Rasta language. In-depth coverage of concepts such as "Babylon," "I-and-I," as well as the tendency of Rasta's to literalize word parts around the meaning of words is helpful.
This chapter will also help explain why Rastas shy away from vocalizing oppresion language in there own usage---while making it explicit in the language of those from Babylon.. Thus, "oppressor" becomes "downpressor"--conjuring up pictures of active political suppression. Certainly few understand better than the Rasta the power of language to control and direct thought and action.
In addition to this volume, check out the work of Leonard Barrett, and the book "Chanting Down Babylon:The Rastafari Reader" for more, informative, insightful information about this minority religio-cultural movement.