The Bletchley Circle S2, E4

In 1952, four women who worked at the wartime code-breaking centre, Bletchley Park, reunite to track down a serial killer.

Cast:Rachael Stirling , Julie Graham , Sophie Rundle , Anna Maxwell Martin , Mark Dexter , Hattie Morahan , Faye Marsay , Nick Blood , Ed Birch , Michael Gould , Elliot Kerley , Jocelyn Macnab , Steven Robertson , Kieran Bew , Simon Chandler , Edyta Budnik , Matthew Cullum , Brana Bajic