Arcadia Public Library

The Aldens visit an old camp in Quebec, Canada, and begin to suspect that someone or something is trying to scare them away from the place.

While visiting a small town in Alabama, the Aldens hear mysterious howls at midnight, leading them to wonder if an old local legend about a ghost dog is true.

When their grandfather buys a bookstore at auction in New Orleans, the Alden children help clean it up and discover that several people seem to be obsessed with the store and its contents.

Four orphaned children run away and live in a boxcar, until they are found by their grandfather. Includes a biography and photographs of the author.

After seeing a magician perform, Benny enlists his dog Watch to help him put on his own magic show, but then both Watch and Benny's magic bag disappear.

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

While staying at the Winding River Lodge, the Alden siblings investigate tales of a zombie haunting a lake in the woods.

The Alden children help out a storeowner at the Hope Harbor Mall and discover that someone is tampering with the merchandise shipments.

"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 game called Geocaching. Soon, Henry, Jessie, Violet, and Benny are searching all over town for hidden boxes and making friends with other kids in the geocaching club. But is one of the club members a thief?" -- p. [4] of cover.

When the children uncover a strange puzzle in a friend's back yard, it's the start of a "spy game" leading to gold. But first they must make sense of an old photo and a riddle, and learn just who is behind this mystery within a mystery.