Former Detective Chief Superintendent Bob Booth recalls the hunt for multiple killer Donald Neilson, the so-called Black Panther, whose reign of terror culminated in the kidnap and murder of teenage heiress Lesley Whittle in 1975. Only after Neilson's arrest did it emerge that he had previously killed three sub-postmasters and a security guard, and carried out hundreds of armed robberies. (thetvdb.com)