The gang returns for a brand new series and the Lyell Centre has a new boss in the shape of forensic pathologist Thomas Chamberlain, who is met with a frosty reception from Nikki, Jack and Clarissa, who are still coming to terms with the death of Leo. Meanwhile, detectives are demanding results in two unsolved cases involving a wealthy mother and son murdered in their London home and the disfigured body of a young woman. Richard Lintern joins the cast for the first of a two-part story that we're sure will be every bit as enthralling as always.