Brought to Los Angeles for treatment, a recovering junkie soon learns that the rehab center is not about helping people, but a cover for a multi-billion-dollar fraud operation that enlists addicts to recruit other addicts.向东是个未知的世界，大家都颇为犹豫，所以最后选择了回头，不过想到车上那点粮食和燃油，而来时的路已经走了有五天，众人心头沉甸甸的，说不定走不完这五天的回头路就会把补给耗光，偏偏回程的沿途是没法补充食物的，现在只有走一步算一步。