In 1986, five-year-old Saroo lives with his older brother Guddu, his baby sister, Shekila, and his mother in Khandwa, India. Saroo and Guddu search for food and sneak into train stations. One night, Saroo boards a train that doesn’t stop. He spends two months in fear and hunger. After an orphanage, he is adopted by an Australian couple. After university, Saroo returns to India to search for his family.