Set in an Old Dark House, a man is murdered in his study. With his dying breath, he tells his brother of two clues to finding hidden Eastern Indian jewels that were part of a precious idol. He wants his brother to locate the treasure, so that it can be given to his son. But before the treasure can be found, a third clue must be discovered.

Facing an arranged marriage to a man of dubious morals, heiress Korah Hurley poses as the impoverished travelling companion of her aunt, the Marquise de Jaurmais, in order to test whether her rakish fiancé's affections are truly for her or for the fortune she will inherit.