The Lady in Blue by Fred M. White

When Spencer Clutton left the diplomatic service, at a comparatively early age, his friends only lamented the fact that he had voluntarily cut short an exceedingly promising career. He possessed youth and brains and breeding, to say nothing of powerful influence. He was already marked out for an important post, and then, without consulting anyone, he sent in his resignation. He was known to be keen on his work, and, though he had little or no money, success was in his grasp.

He had declined to discuss this sudden decision. He showed no regret or disappointment, and from that day forward not a soul had ever known the reason why Spencer Clutton cut himself adrift from all his most cherished ambitions.