"On the Edge of the Razor" is a specialized book that addresses the complex topic of vulnerability in the context of migration. The author, Philippe Schaffhauser, aims to develop an interpretative perspective that allows for an understanding of the impacts of Mexican migration to the United States. Rather than establishing a comprehensive theory, the concept of vulnerability is viewed as encompassing both subjective and objective dimensions. The book explores how these dimensions interact in social contexts and the role they play in the perception and stigma of migrants. Through the analysis of three specific cases that highlight aspects such as religiosity, social struggles for labor rights, and the effects of the criminalization of migrants, the work offers valuable insights into the social processes that shape the experiences of migrants. It is a significant contribution to the social science discussion on migration and vulnerability.