Nancy receives a letter meant for a British heiress who has the same name and, in her attempts to contact the other young woman, faces danger from a man who operates a Lonely Hearts Club mail fraud.

Nancy and her friends George and Bess attempt to exonerate an inventor who is suspected of arson.

Blind violinist Deirdre Thompson is vying for top honors in Seattle's most prestigious musical competition, but Nancy finds that something about the contest strikes the wrong chord.