A stick of dynamite causes chaos for Duggie when it is brought into Carlisle's main police station and the armed response unit is called out after there is a report of a gun being spotted in a city centre bar. Duncan receives a shock when a cyclist who has been trapped under a car turns out to be someone he knows, officers haul in a driver who is well over the limit and Hayley comes to the rescue when a teenager's car hits a wall during a late-night drive. Documentary following the work of Cumbria's Roads Policing Unit