Three years after his sudden disappearance, former MI5 officer, Bruce Harrison, turns up in a psychiatric hospital suffering from amnesia. All he remembers of his past life are the phrases Clean Start and Stonebridge.
When Lewis Pritchard, head of GCHQ’s K-division, is informed of the reappearance, he sends Anne Patterson to investigate if it really is Harrison.
It soon becomes clear that there are others keen to get a hold of Harrison.