In this episode of My Biggest Book, where prominent authors ponder their breakthrough novels, Emma Donaghue recalls her 2010 novel Room.

Inspired by the famous Fritzl case, it's about a boy and his mother held captive in a small room, the only world the child, Jack, has ever known. 

The book was shortlisted for the Booker and in 2015 the film version was released. That adaptation was also written by Emma Donoghue, and it won an Oscar for Brie Larson, who played Jack's mother, Ma. But these accolades came later in her writing career and Emma has some sage advice for younger authors.