这是一个根据真实的故事改编的影片，讲述了一名5岁的印度小男孩因与家人意外走丢，被一对澳洲夫妇收养，最终在25年后重返故土的故事。

Lion is the heartbreaking and inspiring original true story of the lost little boy who found his way home twenty-five years later and is now a major film starring Dev Patel, Nicole Kidman and Rooney Mara.

As a five-year old in India, I got lost on a train. Twenty-five years later, I crossed the world to find my way back home. Five-year-old Saroo lived in a poor village in India, in a one-room hut with his mother and three siblings... until the day he boarded a train alone and got lost. For twenty-five years.

This is the story of what happened to Saroo in those twenty-five years. How he ended up on the streets of Calcutta. And survived. How he then ended up in Tasmania, living the life of an upper-middle-class Aussie. And how, at thirty years old, with some dogged determination, a heap of good luck and the power of Google Earth, he found his way back home.

Lion is a triumphant true story of survival against all odds and a shining example of the extraordinary feats we can achieve when hope endures.

Saroo Brierley was born Sheru Munshi Khan in Ganesh Talai, a suburb within Khandwa, Madhya Pradesh. When he was young, his father left his mother, throwing the family into poverty. His mother worked in construction to support herself and her children but often did not make enough money to feed them all, and could not afford to send them to school. At age 5, Saroo and his older brothers Guddu and Kallu began begging at the railway station for food and money. Guddu sometimes obtained work sweeping the floors of train carriages. One evening, Guddu said he was going to ride the train from Khandwa to the city of Burhanpur, 70 kilometres (43 mi) to the south. Saroo asked his older brother if he could come too. Guddu agreed. By the time the train reached Burhanpur, Saroo was so tired he collapsed onto a seat on the platform. Guddu told his little brother to wait and promised to be back shortly. Guddu did not return and Saroo eventually became impatient. He noticed a train parked in the station and, thinking his brother was on it, boarded an empty carriage. He found there were no doors to the adjoining carriages. Hoping his brother would come for him, he fell asleep. When he awoke, the train was travelling across unfamiliar country. Occasionally the train stopped at small stations but Saroo was unable to open the door to escape. On that same night that he fell asleep on the train platform, his brother, Guddu, was killed by an oncoming train. Saroo's rail journey eventually ended at the huge Howrah railway station in Kolkata (then known as Calcutta), and he fled when someone opened the door to his carriage. Saroo did not know it at the time, but he was nearly 1,500 kilometres (930 mi) from his hometown.

Saroo attempted to return home by boarding different trains, but they proved to be suburban trains and each one eventually took him back to Howrah railway station. For a week or two, he lived on and around Howrah railway station. He survived by scavenging scraps of food in the street and sleeping underneath the station's seats. Eventually, he ventured out into the city, and after days of homelessness on Kolkata's streets, he was found by a railway worker who took him in and gave him food and shelter, but Saroo fled when the railway worker showed Saroo to a friend and Saroo sensed that something was not right. The two men chased after him, but he managed to escape.

Saroo eventually met a teenager who took him to a police station and reported that he might be a lost child. The police took Saroo to a government centre for abandoned children. Weeks later, he was moved to the Indian Society for Sponsorship and Adoption. The staff there attempted to locate his family, but Saroo did not know enough for them to sufficiently trace his hometown, and he was officially declared a lost child. He was subsequently adopted by the Brierley family of Hobart, Tasmania, Australia.

In the meantime, his mother, Kamla Munshi, searched for her two sons. A few weeks after her sons failed to return home, police informed her that Guddu's body had been found near the railway tracks, a kilometre (0.6 miles) from Burhanpur station. He had been struck by a train. She then confined her energy to looking for Saroo, travelling to different places on trains. She visited a mosque every week to pray for his return.