Divided We Fall (short story)

The story involves a man's return to Earth after a multi-year contract job on another planet.

Apparently, a new race of "Synthetic Humans", or "Syns" has been created and is now intent on taking over the world.

The problem is, the only way to identify a "Syn" is by a highly sensitive ECG's reading of a particular brainwave pattern, and the Syns are said to have the ability to fool the test much of the time, so they can "pass" many such tests before being detected.

After much adventure and tragedy, he realizes what has truly happened to humanity and his planet, as well as the computer's role.

Jones's story was adapted into an episode of the UK TV series Out of This World, with a teleplay by Leon Griffiths and a cast including Ronald Radd, Bernard Horsfall, Ann Bell and Clive Morton.