"Public Faces" was written in 1932, a fictional novel about diplomacy in 1939, within a framework of science fiction (credible scj-fi, not fantasy!). The author Harold Nicolson was a diplomat, and he spins his tale around British government maneuvering and intrigues of the 1930s. As a prediction of the future (from 1932), it is a mixed success: no Hitler, no Stalin, no Great Depression. Then, again, it predicts the rocket airplane and the atomic bomb--the latter pretty accurately by what we now know (more like an H-bomb, really).
It is this prophetic component which merits its 4 stars; in other ways, it may seem a bit dated, perhaps because it IS faithful about the (rather peaceful!) 1930s background. For something completely different, it is definitely worth reading now.