The book "Controversial questions on the history of Russian-Lithuanian law" by F. and . Leontovich is a fascinating and in-depth study that immerses the reader in the complex world of legal systems that existed at the junction of two cultures: Russian and Lithuanian. This work will be a real find for those who are interested in the history of law, the legal traditions of Eastern Europe and the interaction of different legal systems. Leontovich, known for his in-depth research in the field of law, offers the reader not only a historical analysis, but also a lively discussion of topical issues related to legal norms and their evolution in the context of Russian-Lithuanian relations. The book covers a wide range of topics, from the formation of legal institutions in the Grand Duchy of Lithuania to the influence of Russian legislation on Lithuanian legal practices. Readers will see how historical events, such as wars, dynastic marriages, and political unions, influenced the development of law in both states. This book will be of interest not only to lawyers and historians, but also to anyone who wants to understand how legal systems are formed under the influence of cultural and political factors. Students of law schools, researchers, as well as lovers of history will find in it a lot of useful and entertaining information. The age category of readers is not limited, since the subject of the book is relevant for all who seek to expand their knowledge of law and history. One of the key topics raised in the book is the interaction and mutual influence of the Russian and Lithuanian legal systems. Leontovich explores how these two traditions, despite their differences, were able to coexist and even enrich each other. It analyzes how legal norms have adapted to new conditions and how they have reflected social and cultural changes in society. This topic is particularly relevant in light of the current debate on legal systems and their capacity to adapt in the context of globalization. Leontovich's style is distinguished by clarity and accessibility, which makes complex legal concepts understandable to a wide audience. His ability to combine a scientific approach with a fascinating narrative allows the reader not only to gain knowledge, but also to enjoy the reading process. The author is also known for his other works that deal with the history of law and legal philosophy, which emphasizes his in-depth expertise in the field. The book "Controversial questions on the history of Russian-Lithuanian law" not only explores historical facts, but also asks important questions about the nature of law, its role in society and how historical events shape legal norms. This work will be a valuable addition to the library of anyone interested in the history, law and culture of Eastern Europe. Readers looking for in-depth analysis and rich context will find plenty of ideas for reflection and discussion in this book. In conclusion, "Controversial issues on the history of Russian-Lithuanian law" F. and . Leontovich is not just a book, but a whole world worth diving into. It opens up new horizons for the reader to understand legal systems and their historical context, doing so with the skill and passion inherent only in a real connoisseur of his craft.