With his mind transferred to another body, Number 6 wakes up in his London flat and can't convince his colleagues who he is. He takes off to Austria to find the one man who can help him, the person Number 2 wants him to find.

Back in London, Number 6 is trying to track down a crazed scientist who is protected by his homicidal daughter.

After witnessing the trials of Number 2 and Number 48 and meeting the President of the Assembly, Number 6 escapes during the chaos that follows.