Warner, Gertrude Chandler

Henry, Jessie, Benny, and Violet Alden meet Mike Wood and a strange chain of events begins. Mike's house is mysteriously burned down, a man in a blue hat appears, and the Alden's uranium mine is in danger of being sabotaged. The four youngsters must solve the mystery.

The Alden children find an unusual mystery when they spend a vacation on a supposedly deserted South Seas Island.

Henry, Jessie, Benny, and Violet Alden meet Mike Wood and a strange chain of events begins. Mike's house is mysteriously burned down, a man in a blue hat appears, and the Alden's uranium mine is in danger of being sabotaged. The four youngsters must solve the mystery.

The Alden children find an unusual mystery when they spend a vacation on a supposedly deserted South Seas Island.

Four brothers and sisters make a home for themselves in a deserted boxcar on the assumption that their rich grandfather does not want them.

The Boxcar children travel to Maine, take canoes into the wilderness and live in a house exactly like the one on Surprise Island, except the Maine house is brown, not yellow. They untangle the mystery of the two houses.