Just as the Princess in the playroom is about to enjoy a carrot cupcake, it vanishes from the plate! She's transported into a fantasy world where she, as a detective with Bona as her assistant, sets out to solve the mystery. Cupcake crumbs lead them to a mustachioed stranger on a bicycle. After a thrilling chase, they unmask the stranger to reveal the hungry Prince, who hadn't even had a bite of the cupcake. Seeing her brother's hunger, the Princess shares her cupcake, leading to a harmonious resolution as they all enjoy the treat together.