In what is considered one of Heinlein's most hair-raising, thought-provoking, and outrageous adventures, the master of modern science fiction tells the strange story of an even stranger world. It is 21st-century Luna, a harsh penal colony where a revolt is plotted between a bashful computer and a ragtag collection of maverick humans, a revolt that goes beautifully until the inevitable happens. But that's the problem with the inevitable: it always happens.

Winner of the 1967 Hugo award, this novel marked Heinlein's partial return to his best form. He draws many historical parallels with the War of Independence, and clearly shows his own libertarian political views.