This description of Sunwar, an endangered Tibeto-Burman language spoken in eastern Nepal, is based on extensive field work by the author and contains a chapter with background information on the Sunwar language, its speakers and their culture, followed by sections on the phonology, the indigenous writing system and the morphology of Sunwar. Verb paradigms, glossed texts, a Sunwar-English glossary and bibliographical references are also presented.Contact between the Sunwar and Nepali languages resulted in language change, most visible in the verbal system, where the older biactantial agreement system typical for Kiranti languages disappeared and suffix conjugations emerged.This book will interest those interested in descriptive linguistics, language change and languages of South Asia.