A single gunshot in the Moroccan desert wounds an American tourist and sends shockwaves rippling across the globe, entangling the lives of strangers who will never meet. In four interlocking strands a fractured marriage, two shepherd boys, a Mexican nanny crossing a border and a deaf-mute Japanese teenager collide through chance, miscommunication and the accidents of a connected world. Alejandro González Iñárritu completes his trilogy of fractured narratives with a sprawling meditation on the barriers of language and understanding. Ambitious and mournful, it finds tragedy and fleeting grace in the failure of human beings to truly reach one another.