When Tom Grant is transferred from the glamour of MI5 to a little known intelligence department, he begins to think that his career is on the slide.

Then, the investigation into the death of an agent leads him into a plot to strike at the heart of the UK ... But who can he trust? The Colonel - the loud and overbearing Department head? ... Major Green - the dashing war hero with the dedicated team? ... or Normanby - the prim bureaucrat with dark secrets in his past?