The Boxcar Children's friend Mike is wrongly accused of starting a fire. Can they discover who is really behind Mike's mystery?

Relates the exploits of the four Alden children as they locate a missing man. The Boxcar children are determined to solve the mystery that surrounds an old yellow house on their grandfather's property. Strange things have happened in that house where long ago a man disappeared.

The Aldens climb a mountain and find a mystery! The hike up Old Flat Top was only supposed to take a day, but a dangerous rockslide changes everything to reveal a hidden cave that just may hold a legendary treasure!

A young Canadian visitor helps the Alden family solve a mystery involving a lost coin collection.

Two brothers take summer jobs at a department store where a series of peculiar events brings them under suspicion.

While helping fix up the old house their cousins have bought, the Aldens hear stories about its being haunted and find evidence suggesting that there may be a ghost there.

The Alden children, isolated in a storm at a small bus station, are led into a mystery centering on a polluted river.

The children, who are spending the summer in a lighthouse on the New England coast, are disturbed by a mysterious woman walking the lighthouse grounds. Jessie's dog Watch wakes up growling almost every evening at midnight, and Henry finds a puzzling note in the sand.

While helping run Jerry Taylor's general store, the Alden children investigate his mysterious employee Nancy.

While visiting the seaport town of Ragged Cove, Massachusetts, the Alden children find the ship's log of the Flying Cloud, shipwrecked in 1869, supposedly during a mutiny.