Gertrude Chandler Warner
11) Surprise Island
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Description
"Henry, Jessie, Violet and Benny used to live alone in a boxcar. Now they have a home with their grandfather and are spending the summer on their own private island. There's a mysterious stranger on the island who must keep his identity a secret. And that's not the only surprise in store for the Boxcar Children on Surprise Island!"--Page 4 of cover.
12) Mystery ranch
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Description
The Boxcar Children, now living with their grandfather, spend the summer on their Aunt Jane's ranch. Their aunt seems quite unhappy until at the end of the summer a surprise discovery brings happiness to all.
18) The mystery girl
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Description
While helping run Jerry Taylor's general store, the Alden children investigate his mysterious employee Nancy.