The Ruga Language written by Caroline r. Marak, retired professor from the Department of Garo in the Tura Campus of the North Eastern Hill University (NEHU) and published by ABILAC, provides a comprehensive linguistic description of the Ruga language which is an endangered indigenous language once spoken by its speakers inhabited within the Garo Hills. In the preface, Prof. Robbins Burling, one of the most accomplished and seasoned linguist on Tibeto Burman languages of Northeast India, lauds the effort of the author Caroline R. Marak in collecting sufficient data for preparing this descriptive book on the endangered language. This book consists of seven important chapters namely, Introduction, Phonology, Verbals, Nominals, Syntax, Vocabulary and Short sentences apart from the Prefatory notes such as prefaces, Bibliography and also maps. This book consists of a total of 124 pages. This book is a valuable addition to the collection of linguistic description of endangered languages of Northeast India as well as to that of the world.