More than anything in the world, little Saroo loved his mother, brothers and little sister. But one day he lost them all... Together with his older brother, Saru, he went to another city - and got lost. A five-year-old boy found himself on a train that was taking him into the unknown... The kid did not know either his last name or the name of the town where he lived. He hoped that one of the trains would bring him home, but they only took him further and further... Only 25 years later Saroo was able to hug his old mother. All these years she did not lose hope and waited that one day her boy would return...