Hopscotch is a 1975 novel by Brian Garfield, in which a CIA field officer walks away from the Agency in order to keep from being retired and placed behind a desk, and invites the Agency to pursue him by writing an exposé and mailing chapters of it piecemeal to all the major intelligence agencies around the world, including the CIA. Hopscotch won the 1976 Edgar Award for Best Novel. In 1980, the novel was made into a film with the same name, for which Garfield also cowrote the screenplay. The film starred Walter Matthau. Although the novel has a dark, cynical tone, the film is a comedy, but the plot follows that of the novel fairly closely. Source: Wikipedia (en)