Pinkie Pie and the cupcake calamity

"Pinkie Pie loves her job at Sugarcube Corner. She gets to work on perfecting the best cupcake recipe EVER and is always surrounded by treats! Things seem as if they're going to get even sweeter when Rarity becomes the new cashier, but it turns out that Pinkie and Rarity don't always see eye to eye on customer service. Just when Pinkie Pie thinks her predicament couldn't get stickier, a big corporate bakery moves in across the street and steals all of Sugarcube Corner's business! Can Pinkie Pie and Rarity work together to find a way to save Canterlot High's favorite bakery?"--Back cover.