Silent Witness: Squaring the Circle, Part 1

The nanny of a Russian oligarch is killed in a botched assassination attempt, a bloody shootout that also leaves an unknown hitman dead. As the team joins forces with young DI Sarah Parks to ascertain the identity of the dead would-be assassin, further questions begin to mount - who would want the businessman dead, and why? First in a two-part story, starring Emilia Fox, David Caves and Richard Lintern, with Lauren O'Neil, Pippa Haywood and Shaun Dingwall