When Grandma Gabby moves in with the Tuttle Twins, she takes her twin grandkids on a wheelchair time machine to France and the Old West to learn about laws and try to save their lemonade stand. By learning about the principles Frédéric Bastiat writes in his groundbreaking book, The Law, the twins are able to save their stand!

A science camp rivalry threatens to destroy Emily’s dreams. Grandma takes the twins to India and a worm battlefield to learn about the golden rule before it’s too late. By learning about the golden rule of fiscal policy, the twins are able to save Emily’s dreams!

Argh! The twins encounter space pirates, a Scotsman, and ice cream people as they learn about free trade and why no one can make a pencil by themselves.

With the help of Ben Franklin, the Twins learn what it means to be an entrepreneur and start their own corndog stand. By learning about entrepreneurship, the twins are able to grow a business… Too bad Karinnie has some business plans of her own.

The Twins learn that big businesses like Big Bob's BBQ can sometimes produce laws that keep smaller businesses like Food Trucks from being able to survive. They visit Atlantis and try to stop the protectionism there before things get too wet.

Why does your money increasingly lose its value? With their eyes set on a big carnival prize, Ethan and Emily learn that printing more tickets causes prices to rise. They visit Ancient Rome and Modern Zimbabwe to see the Inflation Monster at work then rush back to save the carnival.