The news that a homeless man had been stabbed to death in early 2014 shocked Melbourne. In the days that followed, people flocked to the CBD, giving food and blankets to those in need. The dead man was Morgan Wayne Perry, though on the streets he was better known as "Mouse". He'd been killed by a young man from a privileged background, who'd been living alone in an apartment near where the incident took place. For Morgan's sister Michele Perry, it was the start of a journey to understand what happened to him.