Dr Aziz is a young Muslim physician in the British Indian town of Chandrapore. One evening he comes across an English woman, Mrs Moore, in the courtyard of a local mosque; she and her younger travelling companion Adela are disappointed by claustrophobic British colonial culture and wish to see something of the 'real' India. But when Aziz kindly offers to take them on a tour of the Marabar caves with his close friend Cyril Fielding, the trip results in a shocking accusation that throws Chandrapore into a fever of racial tension.
