The Ordeal of Gilbert Pinfold by Evelyn Waugh

A successful, middle-aged novelist with a case of 'bad nerves,' Gilbert Pinfold embarks on a recuperative trip to Ceylon. Almost as soon as the gangplank lifts, Pinfold hears sounds coming out of the ceiling of his cabin: wild jazz bands, barking dogs, loud revival meetings. He can only infer that somewhere concealed in his room an erratic public-address system is letting him hear everything that goes on aboard ship. And then, instead of just sounds, he hears voices. But they are not just any voices. These voices are talking, in the most frightening intimate way, about him!