In this episode, it's the rookie Sgt Rob Grunner's turn - the singing burglar, Hull's worst car thief and the alleged cat killer are regulars who all know the rules and how to bend them. A young female shoplifter pushes the contest to the brink and faces a 50,000 volts tazer gun. The only other rookie in the Lock Up is the champagne-drinking mother of three, caught over the limit.