Nancy and her friends think there is nothing more fun than ice cream in the summer. So when they find out that the owners of the local ice-cream factory are hosting a contest, the Clue Crew can't wait to enter! Contestants must come up with brand-new flavors. And they can use whatever ingredients they want! Nancy is sure that her entry — Clue Berry — will win! But when a friend's secret recipe goes missing, Nancy suspects that someone not-so-sweet is up to no good.