The Bobbsey Twins hope to expose some rather suspicious activities at the Silver Town Mint Center.
The Bobbsey twins stay on a Pennsylvania farm and become involved with a mysteriously vanishing prowler and a search for a golden birthday present.
While in California appearing in a television show, the Bobbsey twins stumble upon a mystery involving a key, a missing dog, and some photographs.
The Bobbsey twins try to track down a missing pony and saddelbag.
