It is 1958. Newly promoted Chief Superintendent Frederick Troy of Scotland Yard is on a Continental trip with his older brother Rod who is taking the entire family on 'the Grand Tour' for his fifty-first birthday. After a concert in Vienna Frederick Troy is approached by an old friend - Soviet spy Guy Burgess who says something extraordinary: 'I want to come home.' MI5 send an agent to de-brief Burgess - but the man is gunned down yards from the embassy and Troy finds himself a suspect. As he fights to prove his innocence Troy finds that Burgess is not the only ghost who returns to haunt him.