1899, Fremantle Asylum, Western Australia. For three years now, Gilberta Brady has kept quiet and stayed out of trouble, hoping to soon be released. But when Norah Devaney screams into the ward with revenge in her heart and a story no-one believes, Brady's carefully guarded peace is shattered. On the run and out of options, they collide with Kedalak and Malkar, Nyungar brothers on their own journey home. They form an unlikely gang of bushrangers and embark on a dangerous mission: track down the man who killed Norah's mum. But little do they know that the Whistling Man is hunting them too.