"Watch two new code-breaking thrillers in The Bletchley Circle, Season 2. The series is based on the lives of four extraordinary and brilliant women who worked at top-secret HQ Bletchley Park during World War II." -- iTunes Store
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From PBS: The cast and crew of “The Bletchley Circle” discuss the inspiration behind the dynamic characters of the series.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.