Warner, Gertrude Chandler

At an old library, the Alden children discover a boy who needs their help and a stranger who is after a valuable object they found in the library.

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.

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

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.

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