The Aldens take part in a hunt at a gem mine and discover that someone is out to sabotage the contest.

While staying at a London inn, the Aldens are puzzled by the peculiar behavior of two fellow guests, a mysterious stranger who follows them, and a misplaced antique brooch.

The Aldens investigate when the new coach of their community basketball league has her Most Valuable Player trophy stolen.

A local radio station is holding the Great Detective Race, and the Boxcar Children have entered the contest! They solve riddles and search all over town for clues leading to the grand prize. But when some of the clues turn out to be fake, it's clear that someone is playing unfairly! Who could be trying to ruin the race - and why?

While helping out part time in a pet shop, the Alden children discover an employee who is smuggling and selling exotic animals.

When an elderly friend is injured, the Alden children offer to help him with his window-washing business in their small town of Greenfield and agree to help him solve a riddle that has arrived in a mysterious invitation.

The Aldens are preparing for a yard sale when they find an old wooden mask in the trash behind a neighbor's house and discover it is an old Native American mask from the Hopi tribe. When the mask is stolen from their garage, the Aldens vow to find it before the weekend Pow-Wow. But with such little evidence, will they be able to find the mask in time? Illustrations.

When the Alden children receive a mysterious message signed by the "Tattletale," they begin to ask questions about a snapdragon that appears in a number of paintings at the local gallery.

When the Boxcar children help out in a local garden, they dig up one strange thing after another! First, the tomato plants seem to move every day. Find out how that can be.