Danielle Argence

Two crooks think up a scheme to get rich at the expense of the vain and excessive Grand Duke.

Lucille, a paralyzed girl, is the scapegoat of her sister and her cousin Josine and Elisa. During a "game" that goes too far, they accidentally kill the lover of Elisa. Whilst attempting to make Lucille bear the guilt of the killing, they discover the frightful secret that would explain the vegetative state of Lucille.

Sherlock Holmes and Watson do battle with their nemesis, Professor Moriarity, over an ancient necklace attributed to Cleopatra.