The book "Foreign Language Attrition" by Claudia Cossarini addresses the phenomenon of language loss caused by a lack of contact with a language. It focuses on the analysis of the grammatical attrition process in the written production of multilingual learners who have not used their third language for approximately one year. The research aims to investigate the effects of language loss on these learners' Italian writing skills. Through a detailed analysis of the results, the book provides valuable insights into the mechanisms of language loss and their impact on multilingual individuals. It is a significant work for professionals and students engaged in linguistics, multilingualism, and the challenges of language acquisition.