article_snippet: In a major turn for the investigation, South Australian police have launched a campaign in a bid to solve a number of the state's cold cases, including Rhianna's disappearance.
article_snippet: Police suspect the 12-year-old was murdered and believe someone holds information that could solve her mother baffling disappearance.
article_snippet: Police suspect the 12-year-old was murdered and believe someone holds information that could solve her baffling disappearance .
article_snippet: Police are urging people who have any information or think Police know something that may help the  investigation to come forward or contact Crime Stoppers on 1800 333 000.
highlights_snippet: SA police have launched campaign to solve a number of SA cold cases .
  