The Alden children save an old woman's house, land, and all the animals in her animal shelter from greedy contractors.

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.

One day in the park, the Aldens' dog, Watch, comes across a mysterious box with a note inside. 'Congratulations!' the note says. 'You've found it!' The box is part of a fun new treasure-hunting game.

After the Boxcar Children move in with their grandfather, they spend the summer having adventures on a private island.

The Alden's neighbor, Lina, thinks there's treasure hidden in her attic, and she wants the Boxcar Children to help her find it. Of course, the children are eager to help search--but it appears they aren't the only ones looking for the treasure. Can the Boxcar Children discover the treasure in the attic, before someone else finds it first?

"Henry, Jessie, Violet, and Benny used to live in a boxcar. Now they have adventures everywhere they go. At a lighthouse, the children find a mystery in the night!"

The Aldens visit Grandfather's friend at the Ogopogo Retreat and aided by puzzling clues, embark on a treasure hunt to prevent the retreat from being sold.

While canoeing and backpacking near Timberwolf Lake, the Aldens receive strange warnings to stay away from the area and stumble upon clues to a missing cache of stolen coins.

The Boxcar Children, now living with their grandfather, spend the summer on their Aunt Jane's ranch. Their aunt seems quite unhappy until at the end of the summer a surprise discovery brings happiness to all.

The hike was only supposed to take a day, but a sudden rock slide changes everything. Now the Aldens are trapped on a mountain!