With an extraordinary flair for code breaking and razor-sharp intelligence skills, four seemingly ordinary women become the unlikely investigators of a string of grisly murders in this orginial thriller, set against the backdrop of post-war London. It’s 1952 and Susan (Anna Maxwell Martin, Bleak House), Millie (Rachael Stirling), Lucy (Sophie Rundle) and Jean (Julie Graham) have returned to post-war domesticity, modestly setting aside the part they played in the Allied victory. Their brilliant work at top security HQ Bletchley Park helped crack the codes used by the German military, producing crucial intelligence that shortened the war. When Susan hears about a string of unsolved murders in London, her old Bletchley spirit is ignited and she secretly reconvenes the formidable foursome to unravel the murderer’s code before they can strike again.
