Five-year-old Saroo finds himself alone and travelling on the wrong train away from his home in northern India. Frightened and bewildered, he ends up thousands of miles 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. Not wanting to hurt his adoptive parents’ feelings, he buries his past, his emotional need for reunification and his hope of ever finding his lost mother and brother. But a chance meeting with some fellow Indians reawakens his secret yearnings. With just a small store of memories, and the help of some newly-developed satellite-imaging technology, Saroo embarks on one of the greatest needle-in-a-haystack quests of modern times.
