After a year away, Silent Witness returned to screens this month as BBC viewers saw Emilia Fox and David Caves reprise their roles as Nikki Alexander and Jack Hodgson. Now in a new location, with the team moving from London to Birmingham, people are ready to see a new string of heinous crimes for the pathologists and scientists to investigate. This week, fans were expecting to see the second two-parter titled The Enemy Within air on Monday night (February 9). The plot for the episodes revolves