In June 1973, seven-year-old schoolboy John Joseph Horgan from Palmerstown, Dublin was bludgeoned with a wooden club in a field close to his home while his mother was out visiting her next-door neighbour in hospital. She had entrusted the neighbour’s grandmother to watch over her son until she returned home. This is one of the most complex and disturbing murder cases we have ever covered. A case Irish authorities chose at the time to shove into what we refer to as Ireland's Pandora's Box.