The Bletchley Circle: San Francisco 1x1 - Presidio

It's 1956, two years after we last saw our women, when Jeanis confronted with evidence that the killer who struck down aBletchley girl during the war… has resurfaced in SanFrancisco. With a scrap of war-time code from an Americancounterpart (a brilliant cryptographer who worked in thePresidio) Jean and Millie set sail to San Francisco to locatesome of those code-breakers, who they hope might be able tolend support to their investigations. Decoding the decade-oldteletype message leads them to an underground jazz club in theheart of San Francisco, where they meet Iris — an Americanmusician and math genius who served at the Presidio during thewar. She, along with her young engineering prodigy Hailey, isconvinced to join forces with their British visitors, in orderto track a series of murders that have shattered the FillmoreDistrict — a vibrant downtown neighbourhood where Irishappens to live. His twisted signature: cutting out victims'tongues and drawing an inexplicable box on their palms.