When a thief takes the box office money at the school play, Cam uses her photographic memory to solve the mystery.

While visiting Aunt Molly at a fancy downtown hotel, Cam uses her photographic memory to help one of the guests find her stolen luggage and pet cat, and to catch the thief.

"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.

For having skipped the school field trip, Dee, Hector, and Terrence must join the mathletes team but as they are poised to beat the undefeated champions, secret crime fighter Lunch Lady discovers something strange about the opposing team.

While vacationing at a friend's country home, the four Alden siblings try to find a long-missing, priceless brooch and investigate the existence of a ghostly stream.

While spending two days touring a zoo to see the baby animals, the four Alden children, aged six to fourteen, help catch an escaped monkey, participate in a photography contest, and investigate a missing camera.

When a local antique shop owner loses his memory after an accident, the Alden siblings help piece together the man's past to uncover who is holding a grudge against him.

Hoping to become the world's greatest detective, Inspector Flytrap, a Venus Flytrap, assisted by his assistant, Nina the Goat, investigates a thrilling mystery at the Capitol Building at the request of President Horse G. Horse.

"Someone brought a knife to the party. To celebrate the end of high school, Izzy Morales joins her ride-or-die Kassidy and five friends on a 1920s-themed getaway at the glamorous Ashwood Manor. There, Izzy and her friends party in vintage dresses and expensive diamonds-until Kassidy's boyfriend turns up dead. Murdered, investigators declare when they arrive at the scene, and now every party guest is a suspect. There's the girlfriend, in love. The...

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