The book "Prises d'otages et criminalité transfrontalière : ce qu'il savoir pour mieux sauver des vies" (Hostage-taking and cross-border crime: what you need to know to save lives) by Jean-Bosco MANGA is a work that deals with the problem of hostage-taking and cross-border crime. The author discusses the different forms of hostage-taking and cross-border crime, the motivations of kidnappers, the techniques used to carry out these acts, and the different approaches to dealing with them. The book also offers practical advice for those who may be confronted with a hostage situation, as well as for the authorities in charge of managing such situations. In short, this book is a useful resource for understanding the issues surrounding hostage-taking and cross-border crime, and for improving the prevention and management of such situations.