Sherlock Holmes and the King's Evil: And Other New Tales Featuring the World's Greatest Detective
became a mistress of Miss Openshaw’s academy. Our visitor continued.
    “The letter in its envelope was found by me after both Abraham and Roland disappeared on Sunday night. I have shown it to no one. In the first place, I should like it to be read by a medical man. Even at Mablethorpe, I had heard something of Dr Watson who works in partnership with Mr Sherlock Holmes of Baker Street. The letter, combined with the disappearance of my brothers, persuaded me that I should come to you.”
    She seemed an admirable young woman, polite but determined. If she appeared more composed than might have been expected at such an anxious time, I put that down to the inner strength of a quiet personality. I have seen such a balance of characteristics often enough in medical practice.
    “First tell me a little about your brothers, Miss Chastelnau”
    “They are the two keepers of the Old Light on the river estuary at Sutton Cross. It lies on the coast of the Wash about forty miles south of Mablethorpe and just above Kings Lynn. It is not a proper lighthouse but a beacon standing on nine wooden stilts. There is a barrack-room and a lantern-room above. It is on the mudflats near the river estuary and is cut off from the land for an hour or two each side of high tide.”
    “And the letter?”
    “it was before dawn on Monday morning that the mechanism stopped and the flashing beam from the lantern failed. The absence of my brothers was discovered soon afterwards and I was summoned from Mablethorpe later that day. I found the letter at the back of the barrack-room table drawer. I have naturally read the contents, Dr Watson, and I beg you to do the same.”
    With that she handed me the envelope. I was at once struck by the disparity between the quiet but self-possessed manner of the schoolmistress and the deliberation of the ill-educated hand in her brother’s writing. I should hardly have thought them brother and sister unless I had been assured of it.
    I read the single sheet of paper carefully. It certainly seemed like a letter, for the address of the sender was at the top. “The Old Light, Sutton Bridge, Boston Deeps.” It is common knowledge that the Boston Deeps remain the one navigable channel through the shallow and silted waters of The Wash. The sea has receded for centuries on that part of the Lincolnshire coast. The channel is little used now, I believe, except as a temporary anchorage for the coastal trade. I had supposed the land to be so flat, like the rest of East Anglia, as to make a lighthouse something of a rarity. Presumably, this light at Sutton Cross was a warning to ships of the point at which the Boston Deeps give way to treacherous sandbanks.
    I glanced at the foot of the page and saw printed in uneven capitals the name of Abraham Chastelnau. It is an unusual surname for an Englishman. Yet it reminded me that East Anglia had become the home of Protestant Huguenot craftsmen, fleeing from France at a time of religious persecution two hundred years earlier. They were industrious and law-abiding folk who had done well in their new home.
    The writer’s appeal was addressed to “Dear Doctor.” Who that might be, I could not tell.
    I am a man that is afflicted with evil beyond endurance. I have lived with it many years and once or twice thought I had come out of. But I was wrong. I have heard that in days gone by a holy man might have helped me. I once thought I had found his secret but now it is lost again. If I could take a wife I might be better for it. The truth is I bear the brand upon me and no woman could tolerate the company of such a man. I cannot hide what I am and none will come near me. I need a physician who can do miracles. If you are that man please write what the cost will be.
    Your respectful servant,
    Abraham Chastelnau.

    I read this through and then laid the paper down.
    “I hoped when I read it that perhaps he had heard of you and your friend,” said Miss Chastelnau softly, “But I cannot tell

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