Ben Smee, Guardian Australia’s Queensland correspondent, has been reporting on the national crisis of domestic and family violence, as well as the culture and attitudes inside the Queensland police, for years. In the first episode of this special Full Story investigation, Broken Trust uncovers exclusive new evidence in the case of Hannah Clarke and her children. It looks at serious police failings, in the lead-up to the murders, that were overlooked by the coronial inquest and not investigated by homicide detectives