George's friend Marco wants to make his famous tortillas for his abuela's birthday, and George is happy to help! But when George knocks over the bag of masa and the grocery store is all out, George and Marco are worried the birthday surprise will be ruined. Luckily, Uncle Enrique is there to take them on a new adventure to find out where masa comes from, how it's made, and how it gets from the farm to Marco's table.