The Bletchley Circle 2012 ‧ Drama ‧ seasons 1

Four former codebreakers at Bletchley Park during World War II reunite nine years later to uncover a serial killer's next target when one of the four finds a pattern in the serial murders.
Starring: Anna Maxwell Martin; Rachael Stirling; Sophie Rundle; Julie Graham; Hattie Morahan
No. of episodes: 7 (list of episodes)
Network: ITV
Writers: Guy Burt
First episode date: September 6, 2012 (UK)
Spin-off: The Bletchley Circle: San Francisco