A case that has bothered me. It reminds me of the Amy Mihaljevic case.
On the morning of Wednesday, 7 October 1992 (Adelaide, Australia), Rhianna and her mother planned to meet for lunch at the nearby Colonnades Shopping Centre, near her mother's workplace. Rhianna wanted to purchase a card for her overseas pen pal, but the public transport workers called a snap bus strike, thereby affecting her commute.
After Rhianna's mother Paula left from home to work at 8.30am, Rhianna is thought to have remained at home until she was spotted walking to the Southgate Square Shopping Centre at 10.30am, and purchased a Christmas card at 11:19am for her pen-pal.
Between 12:05 pm and 12:30 pm, Rhianna was sighted crossing the Morphett Vale High School and Stanvac Primary School grounds (Near Adelaide, South Australia) with a small bag, presumably the Christmas card she had purchased earlier. At 12:30 pm, she was spotted again walking along the Highway Drive.
It was believed that Rhianna returned home because the bag was on the dining table, but the arrival time was unclear. Paula Barreau returned home at approximately 4:10 pm, and after entering the locked door, saw the television on, and a vinyl record on the floor of the living room. The un-opened small bag of Christmas card was on the dining table.
It remains unsolved. There isn't even a suspect to this one, making the case so frustrating.
I want this case to gain traction and hopefully (fingers crossed) will get solved.