When Sir Arthur Byrne fell ill, after three summers at his post in the little consulate that overlooked the lonely waters of the Black Sea, he applied for sick leave. Having obtained it, he hurried home to scatter guineas in Harley Street; for he felt all the uneasy doubts as to his future which a strong man who has never in his life known what it is to have a headache is apt to experience at the first symptom that all is not well. Outwardly, he pretended to make light of the matter.