Robert Heinlein, L. Sprague de Camp, and Isaac Asimov, Philadelphia Navy Yard, 1944. (Photo credit: Wikipedia) Gulf, by Robert A. Heinlein, is a Sci-fi adventure story/thriller, set on a future Earth and Moon, full of fascinating contradictions. The anachronisms - for example, the plot depends on the physical transmission of microfilms - ought to render it unreadable for a modern reader, but the quality of the writing and the characterisation both take it into the realm of the 'classic'. Written in 19... read more »