Liverpool Sound and Vision Rating * * * *

Cast: Julie Graham, Rachael Stirling, Hattie Morahan, Sophie Rundle, Faye Marsey, David Hounslow, Nik Blood, Edyta Budnik, Brana Bajic, Orestes Sophocleous, Ian Stuart Robertson, Rupert Holliday, Michael Wedder.

With Anna Maxwell Martin’s character having departed the confines of London to go abroad with her husband, the team is one woman short but where better to look for a replacement than the colleague the women of The Bletchley Circle saved from hanging in the previous two part story.