- 'A major work of mounting tensions in which the human mind is the guinea-pig... Mr Fowles has taken a big swing at a difficult subject and his hits...are on the bull's eye' (Sunday Telegraph)
- 'A deliciously toothsome celebration of wanton story-telling... Before one quite realises what is happening, one finds oneself no less avid for meanings and no less starving amid a plethora of clues than is Nicholas himself' (Sunday Times)
- 'A splendidly sustained piece of mystification… such as could otherwise only have been devised by a literary team fielding the Marquis de Sade, Arthur Edward Waite, Sir James Frazer, Gurdjieff, Madame Blavatsky, C.G. Jung, Aleister Crowley, Franz Kafka' (Financial Times)
It has been recently featured on the Modern Library List of Best 20th-Century Novels: No. 71 on the Readers' List and 93 on the Critics' List.