Not knowing what to do with the boy, he took Saroo to the local prison and they transferred him to a juvenile home the following day.
movie, we learned that his father, Munshi, had abandoned the family when Saroo was three.
He found peanuts amongst dirt on the ground and came upon half-eaten food that had been thrown away.
"If you found food on the ground and it smelt right, you ate it," said Saroo.
In the book, he recounts what it was like to get on a plane and set off to find his family, the culmination of a journey that had spanned more than two decades.
The book contains plenty of pictures of Saroo, including as an orphan in India, meeting the Brierleys, growing up in Australia, and reuniting with his birth family as an adult.