Fitzroy Simpson

He was a man of excellent birth and education, who had squandered a fortune upon the turf, and who lived now by doing a little quiet and genteel book-making in the sporting clubs of London.
He was a person of gentlemanly bearing, dressed in a gray suit of tweeds, with a cloth cap. He wore gaiters and carried a heavy stick with a knob to it.
She(Edith Baxter) was most impressed, however, by the extreme pallor of his face and by the nervousness of his manner. His age, she thought, would be rather over thirty than under it.
Arrested in connection with the murder of John Straker and the disappearance of Silver Blaze.