The Sierra Gold Mystery
Instead of dealing with one mystery at a time this time they are working on three mysteries at once. There's a old man who has disappeared in California while, at the same time, they get information about a buried box of gold nuggets. Then Louise's sapphire ring is stolen so they are working on that also.
They end up in California. The story then involves investigating ghost towns, particularly ones where Chinese had settled; getting short clues about the old guy; having other men deny seeing the older guy; putting up with a smart alec young punk from a store; having things thrown on them; getting trapped in a cave-in; dealing with local police; exploring a woods and various other activities that really keeps them busy.
It's a fun story with some actual historical information in it.
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