The purpose of this paper is to provide a radical critical review of Lyle Campbell’s (2013) Historical linguistics: An introduction, (3nd edn.). Edinburgh: Edinburgh University Press. More precisely, it gives an overview, survey, and critique of the main topics, principles, and theories which the work covers. My review is based on using it as the main textbook for ENGL 358 Historical Linguistics for over 5 years where the students say ‘it’s frightening’.