In 2016, a young Afghan driver and translator named Omar makes the heart-wrenching choice to flee his war-torn country, saying goodbye to Laila, the love of his life, without knowing when they might be reunited again. He is one of millions of refugees who leave their homes that year. Matthieu Aikins, a journalist living in Kabul, decides to follow his friend. In order to do so, he must leave his own passport and identity behind to go underground on the refugee trail with Omar. Their odyssey across land and sea from Afghanistan to Europe brings them face to face with the people at heart of the migration crisis: smugglers, cops, activists, and the men, women and children fleeing war in search of a better life. As setbacks and dangers mount for the two friends, Matthieu is also drawn into the escape plans of Omar's entire family, including Maryam, the matriarch who has fought ferociously for her children's survival.