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ITV has released a new trailer for the second series of code-breaking thriller The Bletchley Circle.

Anna Maxwell Martin, Rachael Stirling, Sophie Rundle, Julie Graham and Mark Dexter all return with the additions of Olivier-nominated actress Hattie Morahan, The White Queen‘s, Faye Marsay and Nick Blood.

Written and created by Guy Burt, the drama focuses on a group of former top-secret code-breakers who were based at Bletchley Park during World War II.

The Bletchley Circle returns to ITV on Monday 6th January at 9pm.

Watch the trailer below…