Boxcar children mysteries

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 uncover a double mystery involving an old friend of Aunt Jane's.

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.