To his surprise, an armed robber is convicted, and confesses to other robberies, for one of which Peter Hoskins has already been sentenced to eighteen years. This raises doubts about the methods of Detective Chief Superintendent Trevor Dunn; Hoskins has made a complaint, which lands on Clark's desk. Commander Sparrow pressurises Clark to achieve a quick result, while Hoskins claims to have a videotape of Dunn accepting a bribe. The tape has supposedly been left in a railway station locker and Clark must find it. The tape is found, but Clark finds Naylor trying to remove it to protect Dunn, and it seems that the locker key was not in Hoskins' possession. Meanwhile, it turns out that Sparrow has recently visited Hoskins in prison.