Citizen of the Galaxy is a throw back to the days when a complete story could be told in 250 pages or less. A nice 3 Star diversion to a simpler time in SciFi, when "atomics" were all the rage and everyone had them, strictly for defense you know. Heinlein tells a tale of a young lad, sold as a slave to an old beggar--who is not what he seems. The boy grows and has adventures as he goes on a mission for the old beggar that will journey through several different cultures. Heinlein paints 3 different cultures in full enough detail in just a few pages. Very enjoyable. Well worth a couple of hours -- that is all it will take.