The Aldens investigate when a new store called the Game Spot opens in town and the neighboring shops are robbed.

The Boxcar Children are on a trip with Grandfather to a beautiful island in the South Seas! The island is supposed to be deserted, but as the Aldens explore, they start to find signs that suggest they are not alone. Is there a castaway living somewhere on the island?

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.

"A hip new doughnut shop known for its bizarre recipes is opening up in Greenfield. At first, the owners of the other doughnut shop in town, Delilah?s, aren?t worried. But when the new shop starts making doughnuts that look just like some of Delilah?s greatest hits, the Boxcar Children must figure out if it?s just a coincidence or if someone from the new shop is stealing Delilah?s recipes."--Amazon.com.

While visiting a friend of their grandfather's on Sullivan's Island, off the coast of South Carolina near Charleston, the Boxcar Children encounter mysterious activities related to rumors of a buried pirate treasure.