It is field trip day to the city museum, and while Stewart expects a boring day of facts and learning, Waldo and Sassy are looking forward to lunch; then they find that the dinosaur room is full of tempting bones, the astronaut boots are good for chewing, and one of the dioramas features a squirrel on a sidewalk, but the highlight is the delicatessen--if only Waldo and Sassy's disguise can fool the guards who are searching for two dogs.

Fergus and Zeke love being the class pets in Miss Maxwell's classroom, and they do everything the students do--listening at storytime, painting masterpieces during art class, and keeping their own special journals. But when it's time for the school science fair, the mice aren't sure just how to get involved. Lucy wants to time them as they run through a maze, but they want to do an experiment, not be an experiment. Then Zeke comes up with a great...

Fergus, the pet mouse in Miss Maxwell's classroom, stows away in a backpack on a field trip to the museum. He makes a new friend, Zeke, another mouse, who shows Fergus many interesting exhibits, but now he wonders how to get back to school.

It's prehistoric pandemonium as the Catch Club Kids search for an escaped dinosaur that is spreading love and kindness, in this sweet story that combines adventure with STEAM concepts.