The Sierra Gold Mystery

I A Stolen Gift II Ancient Giants III Mother Load Country IV Glimpse of a Suspect V The Hint in the Diary VI Tailing Wheels VII Gold Fever VIII The Harmonica Player IX Landslide X The Mysterious Date XI The Joss House XII Volcano Clue XIII Frog Jumping XIV A Strange Inquiry XV Metal-Detector Clicks XVI Identifying a Thief XVII A Prisoner Bargains XVIII Flashlight Sleuthing XIX A Dangerous Plunge XX The Gold Rocker