On the 12th of February 1993, Denise Bulger (like hundreds of other young mums) was doing her weekly shop along with her 2 year old son James. What happened next was every mother's worst nightmare. In the 5 minutes she looked away from her baby boy, he disappeared. 2 days later, the tiny corpse was discovered miles away in an abandoned railway in the city of Liverpool. The nation obsessed over this case at the time - watching eagerly as more and more details of the police investigations were revealed. Finally, the killers were caught: they were none other than 10 year olds Robert Thompson and Jon Venables.