The London Deception
Franklin W. Dixon
When strange things happen on the set of a murdery-mystery play in London, the brothers believe someone is sabotaging the production.

by Harriet Graham (1988)
In London of the 1890s, two children set out to find their guardian who has disappeared along with his friend, a master magician, and find themselves captive in an opium den with very dangerous characters.
Franklin W. Dixon
When strange things happen on the set of a murdery-mystery play in London, the brothers believe someone is sabotaging the production.
Eloise Jarvis McGraw
Searching for a treasure their great-grandfather left in a "money room" on his farm in Oregon, two children realize that someone else is also searching.
Bonnie Bader & Tracey West
When the world's greatest thief causes a national emergency by stealing Interstate 80, Maya and Ben, the young ACME detectives, set out to track her down.
Jordan Cray
While on a brief vacation in Key West, sixteen-year-old Annie and her stepbrother Nick do an internet search that inadvertently involves them in a dangerous murder mystery.