SIR: Now that "The Big Bow Mystery" is solved to the satisfaction of at least one person, will you allow that person the use of your invaluable columns to enable him to thank the hundreds of your readers who have favored him with their kind suggestions and solutions while his tale was running and they were reading? I ask this more especially because great credit is due to them for enabling me to end the story in a manner so satisfactory to myself. When I started it, I had, of course, no idea who had done the murder, but I was determined no one should guess it. Accordingly, as each correspondent sent in the name of a suspect, I determined he or she should not be the guilty party. By degrees every one of the characters got ticked off as innocent--all except one, and I had no option but to make that character the murderer. I was very sorry to do this, as I rather liked that particular person, but when one has such ingenious readers, what can one do? You can't let anybody boast that he guessed aright, and, in spite of the trouble of altering the plot five or six times, I feel that I have chosen the course most consistent with the dignity of my profession. Had I not been impelled by this consideration I should certainly have brought in a verdict against Mrs. Drabdump, as recommended by the reader who said that, judging by the illustration in the "Star," she must be at least seven feet high, and, therefore, could easily have got on the roof and put her (proportionately) long arm down the chimney to effect the cut. I am not responsible for the artist's conception of the character. When I last saw the good lady she was under six feet, but your artist may have had later information. The "Star" is always so frightfully up to date. I ought not to omit the humorous remark of a correspondent, who said: "Mortlake might have swung in some wild way from one window to another, _at any rate in a story_." I hope my fellow-writers thus satirically prodded will not demand his name, as I object to murders, "at any rate in real life." Finally, a word with the legions who have taken me to task for allowing Mr. Gladstone to write over 170 words on a postcard. It is all owing to you, sir, who announced my story as containing humorous elements. I tried to put in some, and this gentle dig at the grand old correspondent's habits was intended to be one of them. However, if I _am_ to be taken "at the foot of the letter" (or rather of the postcard), I must say that only to-day I received a postcard containing about 250 words. But this was not from Mr. Gladstone. At any rate, till Mr. Gladstone himself repudiates this postcard, I shall consider myself justified in allowing it to stand in the book.