Hunter and Nadir continue on their quest to nail drug dealer Tom Dwyer, but the arrival of new Superintendent John Heaton sees the investigation take an exciting turn of pace when Heaton tasks his officers to catch Dwyer - any way possible. Heaton even hauls in the boy's grandfather on a minor drugs charge in an attempt to use family loyalty as a method of breaking the case. Meanwhile, Sim and Walker investigate a further allegation of suspected rape and soon come to realise that a serial rapist, with a link to minicabbing, could be operating in the area. But with little evidence to identify a suspect, the pair's investigation soon comes to a hault before it's even barely started. (thetvdb.com)