Jenny takes a cake decorating class at The Sweet Shoppe and loves dreaming up unique designs. When her new favorite hobby creates more delicious cupcakes and cakes than her family can possibly eat, she starts giving them to neighbors and friends. Word about Jenny's scrumptious desserts spreads and people begin placing orders at her new business, Cupcake Corner. That's what she calls the bright blue corner cabinet at The Sweet Shoppe that displays her confections. Jenny and her cousin Lucy, who is also her best friend and business partner, donate the money they make to the animal shelter, which sorely needs help. Business is booming and life is pretty sweet. But then Jenny's sketchpad with all of her one-of-a-kind cake designs in it vanishes. Orders suddenly drop off. And a top-secret recipe mysteriously disappears. It certainly looks like someone is trying to put Cupcake Corner out of business! But why?