Girls on the Line is about two girls who live in China. They are from the orphanage, and upon turing sixteen, they age out of the system. Luli needs to start working, and her friend, Yun, has already been working at a factory, so she helps her get a job there. Since they are about sixteen years old, they have to start working. Most of the kids have to work to give money to their families. Two of the girls are from an orphanage, and once they turn sixteen, they age out of the system.