On a class trip to New Orleans, Catalina "Cat" Duran and her friends find themselves in the middle of a voodoo mystery!

On a science class trip to a local cave, Edward "Egg" Garrison and his friends are confronted by the mystery of a faked cave-in.

While in New York City on a field trip, Samantha "Sam" Archer and her friends find themselves immersed in a run of crimes at sightseeing locations.

In San Francisco on a field trip, James Shoo and his friends get caught up in a wave of pickpocketing.

When Samantha "Sam" Archer and her friends in the nature club arrive in Yellowstone Park on a school trip, they find that the park superintendent's son may have been kidnapped.

The Haunted House ride at Fun City is rumored to be haunted by the ghost of someone who died there, and when Samantha "Sam" Archer and her friends get trapped inside they need to find the truth.

While searching for her friends at the Dino Festival, Clementine Wim runs into two people carrying what she thinks is the Tiled Lunch Counter (a famous painting) away from the Capitol City Art Museum, but when she checks the painting is still hanging in place--and before she can track down the thieves, and prove that the painting now in the museum is a forgery, she has to convince her friends that she was not imagining things.

Samantha "Sam" Archer, her friends, and their "kindergarten buddies" are on a trip to the River City Children's Museum, which has been plagued by vandalism, and it is up to the sixth-graders and their new buddies to figure out who the vandals are and why they are set on closing the museum.

James "Gum" Shoo and his friends are on a trip to the River City Natural History Museum, where they discover that a small dinosaur model and some chickens have both gone missing--and the four sixth-grade detectives promptly set out to discover who is behind the theft.