In “Lion,” five-year-old Saroo finds himself alone and travelling on the wrong train away from his home in Northern India. Frightened and bewildered, he winds up thousands of kilometers away, in chaotic Kolkata. Somehow he survives living on the streets, dodging all sorts of terrors in the process. Eventually ending up in an orphanage, Saroo is adopted by an Australian couple, and finds safety and love as he grows up in Hobart.