Relates the exploits of the four Alden children as they locate a missing man. 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 then untangle the mystery of the two houses.

The Aldens are visiting friends for a big Dia de los Muertos celebration. The kids love learning about the holiday and helping out-that is until mysterious events threaten to ruin everyone's preparations. Can the Aldens figure out what's going on and help their friends save the celebration?|The Aldens are visiting friends for a big Dia de los Muertos celebration. The kids love learning about the holiday and helping out-that is until mysterious events...

The Aldens are excited to learn about beekeeping, but when equipment goes missing, they have more than honey to harvest--they have a mystery to solve.