The Opal Serpent - Fergus Hume

An old pawnbroker is found strangled with his lips pinned together with an opal serpent broach. He has a beautiful daughter who is apparently the heir of his large estate. But another claimant has made herself known as the actual daughter of the pawnbroker. Follow detective Hurd as he unravels the convoluted mystery of the old man’s death and attempts to determine who is the rightful heir. (Summary by Richard Kilmer)