Premise: Lion is a 2016 biographical film directed by Garth Davis (in his feature debut) and written by Luke Davies, based on the non-fiction book "A Long Way Home" by Saroo Brierley with Larry Buttrose. The film stars Dev Patel, Rooney Mara, David Wenham and Nicole Kidman.
Hypothesis: Saroo Brierley with Larry Buttrose helped Luke Davies with the writing for the film Lion.