Building a fort in the backyard, a grandfather and granddaughter get help from six simple machines: lever, pulley, inclined plane, wheel and axle, screw, and wedge.

Gram Hatter and Kat set off on an adventure. Gram quickly folds up a pirate hat and places it on Kat’s head and they begin their mission to help clean up the city park. Volunteering turns into a treasure hunt as Kat finds pennies, nickels, dimes, quarters and even a dollar. With each discovery Kat gets a new hat and Gram Hatter teaches Kat how to count her coins as they pick up litter at the park. When Kat adds up her money, there’s enough for ice cream. Or should she donate the money to support the park instead?