In March 2017, the death of a baby boy “known to child safety” sets in motion a frantic few days.Television cameras and uniformed police camp outside the old weatherboard and tin house in Yeppoon where five-month-old Justin* sustained “catastrophic head injuries” while in the arms of his father: an intravenous drug user with a history of paranoia, alleged child abuse and domestic violence.The man tells police he fell while holding the infant and landed on top of him. Detectives doubt the explanation; they treat the matter as a possible homicide.Child safety officers find records showing serious concerns were raised about the boy two months earlier but never formally investigated. “Mad as hell” politicians in Brisbane point fingers about what went wrong.Then the case of baby Justin disappeared.There were no more news reports; no more recriminations about broken systems. The police did not lay criminal charges, despite autopsy evidence of extensive and “highly suspicious” injuries to the child in the weeks leading up to his death.The police investigation was inconclusive but the coroner declined to hold an inquest.Last year Guardian Australia’s Broken Trust investigation revealed serious failures in several domestic violence linked-deaths that were not properly investigated by police and overlooked by coroners.The investigation has now uncovered new and previously unreported evidence about child deaths, including the case of baby Justin.