When a valuable vase disappears, the manager suspects the boys of causing trouble. They're innocent, but who is sending the salespeople mysterious notes? Many more suspicious things will happen before Benny can uncover the mystery.
The Aldens get a job at a department store when things go missing and things appear mysteriously. Its now up to Benny Alden to solve the mystery.
Preceded by Bus Station Mystery, and followed by The Haunted Cabin Mystery.
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