This book introduces an Earth inhabited by billions of city dwellers, frightened to go outside, suckling in the warm continual buzz of the enclosed steel cave which is the city they are born,live and die in. Earth people hate and fear robots who take their jobs. They fear even more the 'Spacers'. Humans who left Earth generations ago to found colonies on 50 other planetary systems. 'Spacers' are tall and noble featured, disease free, live in the open and are totally dependant on their robots. 'Spacers' have the power and it is 'Spacers' who are forcing robots on Earthmen. When a brilliant 'Spacer' roboticist is murdered on Earth, Elijah Bayley, the Earth detective called in to investige is forced to team up with a special 'Spacer' robot R. Daneel Olivaw which looks just like a human. Asimov displays his mastery of the growing relationship between the intuitive, blundering human and the constantly logical robot as they piece together the elements of the crime and capture the murderer. Togther with its sequels, 'the Naked Sun' and 'Robots of Dawn', 'the Caves of Steel' shows Asimov at his best. The reader is drawn inextricably into the world of the future, a thrilling detective story is told and a solid base laid as the first three books in Asimovs 14 book 'history of the future'. One word of warning DON'T TRUST THE COVER PICTURES on any of Asimovs books, they are totally miss leading and seem designed to put you off. All Asimovs books are about real Humans their actions and reactions, especially those which also involve robots.