According to legend, the Purple Emperor diamond, once stolen from Indian Brahmans, brings misfortune to its owners. It is this treasure, over which a curse hangs, that the young lady Margaret Cheney inherits. Soon the girl disappears under sinister circumstances. Her guardian is clearly hiding something, and at night the silence over the family estate is broken by an eerie, seemingly otherworldly howl. Scotland Yard's best detective, "The Man of a Thousand Faces" Hamilton Click, undertakes to unravel the mystery of the fatal treasure and unravel the tangle of tragedies associated with it. The book also includes the novel “The Riddle of the Ice Flame.”