This is definitely for the science-minded for the detailed blueprint of work-in-progress in a heavy gravity field demands mental agility and ability. To recover information from a rocket which has landed on Mesklin, an Earth expedition makes contact with tramp trader Barlennan, gets his promise to help locate their goal. Adventures along the way are solved by earth science and Barlennan trades for an earth education. (The Mesklinites are intelligent beetles). Dust off the brain.