Harry Fielding is a shabby, solitary, but basically cheerful sort, living in a seamy flat in London & subsisting on a diet of gin & pre-packed airline meals in unmarked silver containers. He also works for MI5. Surveillance, protection, the occasional rough-&-tumble just enough to keep body & soul together. However, when Harry witnesses Lisa, his next-door neighbour, killing & burying her sister's violent husb&, he begins to lose his appetite. & when his routine shadowing of a cabinet minister & his mistress ends in her death by kitchen knife, he goes off his food entirely. Harry, crooked man, decides to go straight.