In February 2012, Melbourne schoolgirl Catherine Bernard took her own life after months of online harassment and depression, one of a string of Australian teenagers whose deaths have been linked to cyberbullying. This 101 East episode from Al Jazeera uses her case as an entry point into a country that a global poll ranks first in the world for bullying on social networks, with nine in ten families reporting a child harassed online. Reporters sit with grieving parents, with teenagers who describe harassment following them from the schoolyard into their own bedrooms through Facebook and text messages, and with researchers and legal experts trying to explain why the abuse escalates so quickly online. The film asks pointed questions about what social media companies actually do when abuse is reported, and whether existing law gives police and schools any real way to intervene before it turns fatal. It stays close to Australian families rather than treating cyberbullying as an abstract global trend, and closes with the same question the victims' parents keep asking: who is responsible.