When John O'Brien died in late 2017, he left behind a family already fragile with grief. His wife Lilly and their daughter Megan, 29, made the journey from Sydney to the Central Coast, moving in with family - Lilly's aunt Lea Timmons, her sister Sharon, and Lea's daughter Hannah. At first, it seemed like the right thing to do. Family was supposed to mean safety. But as the weeks passed, the walls of that house began to close in - and what unfolded would test Megan in ways none of them could have predicted.