The book has been written with great detail and clarity, so it can be easily read. ... This is one of a kind monograph that will be very useful for graduate students who are interested in profinite groups, as well as for specialists, as an excellent reference book. The book is a welcome contribution to the literature and will undoubtedly stimulate further development of the theory of profinite graphs and profinite groups. (Mikhail Kabenyuk, zbMATH 1457.20001, 2021) The book systematically develops fundamentals of the theory of profinite graphs, with emphasis on exhibiting similarities with the Bass-Serre theory of abstract groups acting on abstract trees. As such, it provides a valuable reference for students and researchers in the field. (Primoz Moravec, Mathematical Reviews, 2018)