Please note this is a region 2 DVD & will require a region 2 or region free DVD player in order to play The Bletchley Circle is set in 1951 & follows Susan Millie Lucy & Jean all of whom worked as codebreakers at Bletchley Park during the war & have now returned to civillian life At Susan s insistence the four women get back together & use the skills they acquired during the war to crack a murder case which has the police stymied