Midway through the series run, Ofcom and ITV received many complaints from viewers over Blake's willingness to sleep with suspects so that evidence can be gained from them – exemplified in her relationship with murderer James Lampton (Hugh Bonneville).

The other investigating officers in this episode are DCI Mike Hedges (Matthew Marsh), DCS Les Branton (Nicholas Jones), DAC Edward Sumpter (Christopher Robbie), DI Ken Miles (Tristan Gemmill), DS Brian Hall (Paul Brightwell) and DC Carol Browning (Poppy Miller).

Monica Dolan joins the cast as DC Pamela Hayes, following the departure of DI Carol Browning.

This series introduces two new characters to the cast: DCI Doug James (Mark Lewis Jones), and DC Alison Goody (Nadine Marshall), leaving Amanda Burton, Anthony Valentine and Paul Brightwell as the only remaining original cast members.

Les Branton also makes a return to the series, this time, however, played by the original actor, Nicholas Jones.

The series also introduces a further new cast: DS Matt Newton (Niall MacGregor) and DC Marion Randell (Sian Brooke), who join Amanda Burton, Anthony Valentine, Mark Lewis Jones and Paul Brightwell, whose character DS Brian Hall has been suspended from the force.