CIESAS-Sureste) have gathered 14 essays, written by leading specialists in linguistic fieldwork, syntax, and semantics, together with an editorial introduction, to provide a much-anticipated in-depth discussion of headless relative clauses and related constructions in languages of Mesoamerica. Each chapter outlines the general patterns found in a particular language of the region and identifies the cases of variation within each language family or group. The book is a brilliant compendium of reliable new data on relative clauses. It is also of great use as a methodology guide for future studies dedicated to examining a particular phenomenon in a group of geographically and genetically related understudied languages.Any review of such a lengthy volume must be selective. For reasons of space, I will not assess each of the chapters separately; instead, in what follows I will begin by briefly discussing the goal of the project, its main findings, and the general organization of the volume, then proceed by mentioning several questions raised by the presented empirical observations that could be addressed by follow-up research inspired by this book.The volume is the result of the collaboration between the participants of a seminar and two workshops on headless relative clauses organized by Zavala Maldonado, Caponigro, and Torrence in 2016-2018. The main goal of the project, as stated by the authors, was to fill in the gap in the study of headless relative clauses in Mesoamerican languages to achieve 'a better understanding of what is general and what is language-specific in the morphosyntactic and semantic behavior' of such constructions and related expressions (27). The book opens with a must-read Introduction by Ivano Caponigro, 'Introducing headless relative clauses and the findings from Mesoamerican languages', which sets the stage and acquaints the reader with the three types of relative constructions considered in the later chaptersnamely, free relative clauses (introduced by a wh-item only), light-headed relative clauses (introduced by a determiner or a demonstrative) and super-free relative clauses (lacking a wh-expression and a D-type element)and presents a single