Warner, Gertrude Chandler

The Alden children investigate various mix-ups at a zoo run by their grandfather's friend in an effort to save it not only from pranksters but also from the town council.

While visiting Michigan's Upper Peninsula to prepare their Great-aunt Sophie's big old house for sale, the Boxcar Children encounter a mystery involving a valuable ring supposedly hidden somewhere in the house.

"The Aldens are camping on Padre Island National Seashore, which is known for a rare type of sea turtle. But someone on the island is putting the animals at risk!"--Back cover.

Henry, Jessie, Violet and Benny share a mysterious island for the summer with their grandfather.

While fishing and exploring a deserted South Seas island, the Alden children discover clues that they aren't alone.