A scientist who formerly worked at Bletchley Park prior to being reposted towards the end of the war. John is found murdered at the start of series two and it's up to the ladies to find the real murderer and prove Alice's innocence.
Appearances
The Bletchley Circle
Guest cast, played by Paul McGann
- Episode 2x01: Blood on Their Hands, Part 1 (Jan 6, 2014)