Blue Bay 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 and are taking a vacation in the South Seas on an uninhabited island.

But is the island really uninhabited? The Boxcar Children soon suspect someone else is there too -- someone who may not want them around!