Benny Uncovers a Mystery — Gertrude Chandler Warner

One warm night four children stood in front of a bakery. No one knew them. No one knew where they had come from.

Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather. It's summertime, and Henry and Benny are excited about their new jobs in the local department store.

When a valuable vase disappears, the manager suspects the boys of causing trouble. They're innocent, but who is sending the salespeople mysterious notes? And where did the new jewelry in the display case come from? Many more suspicious things will happen before Benny can uncover the mystery....