BBC2 has a new drama series for Friday nights. The main character is a world-weary middle-aged police inspector with an unshakeable commitment to smoking. His work partner is a feisty female officer in her twenties who combines salt-of-the-earth irreverence with being a damn good cop. Between them, they’re investigating the murder of an attractive young woman who their colleagues immediately assumed was a prostitute, and whose death reminds the inspector of a previous investigation that continues to haunt him — which is why his boss is constantly trying to take him off the case.