On the border between Mexico and the United States, police discover the dead body of an immigrant who died during an illegal crossing. There is no form of identification other than a tattoo across his chest that reads “Dayani Cristal.” Armed with a camera crew and this small clue, actor and producer Gael García Bernal sets off on an incredible journey to retrace the immigrant’s footsteps in hopes of answering the question: who is Dayani Cristal?