Two metal barrels and hand-drawn maps: How the mystery of what happened to two young girls snatched from a football oval in broad daylight could finally be cracked

Joanne Ratcliffe, 11, and Kirste Gordon, four, were last seen alive at 3.45pm on August 25, 1973, when they walked to the toilets together during a football game at Adelaide Oval. No trace has ever been found.