The statistics show that children move in great numbers, and many do so alone. While some of the reasons which motivate them to undertake such journeys alone are similar to those of adults – e.g. wars, pursuing aspirations for better social and economic opportunities, ethnic violence, cultural differences, examples of others migrating – others are more specific to children, such as forced child marriages, lack of educational opportunities, forced conscription or being sent ahead to realize family reunification in another country. Similar to adult companions, they suffer and react to ‘democratic deficit’ and ‘developmental (economic) deficit’ and yet they may become more vulnerable in their flight. Reaching their destination often does not mean they are then less vulnerable either. They are faced with specific challenges of integration on economic, social, and cultural dimensions and in many cases also face burdens of the reunification of their family. Yet, there is little attention paid to unaccompanied minors in the literature on ‘forced’ migration. This book largely focuses on unaccompanied minors who arrived in a European country in 2015, with special attention paid to the top-three nationalities of unaccompanied minors, namely Syrian, Afghan and Eritrean minors.