The Dain Curse - Dashiell Hammett

The Continental Op is a short, squat, and utterly unsentimental tank of a private detective. Miss Gabrielle Dain Leggett is young, wealthy, and a devotee of morphine and religious cults. She has an unfortunate effect on the people around her: they have a habit of dying violently. Is Gabrielle the victim of a family curse? Or is the truth about her weirder and infinitely more dangerous? The Dain Curse is one of the Continental Op's most bizarre cases, and a tautly crafted masterpiece of suspense.

From the Trade Paperback edition.

Amazon.com Review
Everything about the Leggett diamond heist indicated to the Continental Op that it was an inside job. From the stray diamond found in the yard to the eyewitness accounts of a "strange man" casing the house, everything was just too pat. Gabrielle Dain-Leggett has enough secrets to fill a closet, and when she disappears shortly after the robbery, she becomes the Op's prime suspect. But her father, Edgar Leggett, keeps some strange company himself and has a dark side the moon would envy. Before he can solve the riddle of the diamond theft, the Continental Op must first solve the mystery of this strange family.

From the Inside Flap
The Continental Op is a short, squat, and utterly unsentimental tank of a private detective. Miss Gabrielle Dain Leggett is young, wealthy, and a devotee of morphine and religious cults. She has an unfortunate effect on the people around her: they have a habit of dying violently. Is Gabrielle the victim of a family curse? Or is the truth about her weirder and infinitely more dangerous? The Dain Curse is one of the Continental Op's most bizarre cases, and a tautly crafted masterpiece of suspense.