Setting out to make his fortune in a far-off country, a young traveller discovers the remote and beautiful land of Erewhon, and is given a home among its extraordinarily handsome citizens. But their visitor soon discovers that this seemingly ideal community has its faults - here crime is treated indulgently as a malady to be cured, while illness, poverty, and misfortune are cruelly punished, and all machines have been superstitiously destroyed after a bizarre prophecy.

In Erewhon, criminals are considered to be ill and are "treated" by "straightners" who make them well, whereas those who have physical illnesses (or suffer bad luck) are considered criminal and are tried and punished. Thus an embezzler will be treated for his "illness" and the party who was robbed will be tried in the Court of Misplaced Confidence. The consistency with which Butler carries through with this conceit is impressive and consistently entertaining, and this is only one of the "curious" conventions of Erewhonian society.

Another fascinating chapter in Erewhon explains how machines are on an evolutionary track that will surpass and then come to dominate their human creators. The detail of the argument is impressive (the discussion of "vestigial organs" in machines is hysterical and accurate), and no matter how far-fetched it must have seemed in 1872 when the book was published, it seems much less a satire and more a serious fear today. This is a book of great intelligence and wicked humour. As a simultaneous mind-stretching exercise and laugh-generating experience, there are few novels of any age that are its peer.