Added table of contents.

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Retained some inconsistent hyphenation (e.g. "deathtrap" vs. "death-trap").

Page 1, changed "commisssion" to "commission" ("a strange commission") and changed "Hargreaves" to "Hargraves" ("Hargraves and Irwin on the case").

Page 3, there appears to be an error in the phrase "It the same name," but this is reproduced here as printed since it is impossible to know whether the original intent was "it is" or "it's."

Page 5, changed "Tow" to "Tom" in "Tom Owens looked again."

Page 6, changed "day" to "way" in "woman led the way."

Page 11, added missing quote after "in a day or two."

Page 12, changed "placed" to "place" in "for which place the yacht sailed" and changed "statute" to "statue" in "statue-like figures."

Page 13, changed "quite" to "quit" in "quit the room."

Page 16, changed "leter" to "letter" ("letter post-haste") and "sudenly" to "suddenly" ("raised suddenly over her head"). Added missing quote before "Don't play spy too often."

Page 22, changed "sudenly" to "suddenly" ("pulled him suddenly").

Page 24, changed "faced" to "face" in "Jem's face paled." Changed "minutes" to "minute" in "Half a minute later." Changed "it" to "is" in "fellow is better paid."

Page 25, added missing "he" to "if he went out on a mission."

Page 26, changed "nawspaper" to "newspaper" ("newspaper containing").

Page 30, "gambling hells" is likely a typo but is reproduced as printed.