Uh-oh! Princess Sweet Pea has a wee problem! Princess Sweet Pea is in for a restless night when she has a sleepover at an unfamiliar castle. A skeptical queen and prince want to test Sweet Pea's princess-ness by hiding a small pea under a hundred mattresses. Sounds reasonable, right? But what is Princess Sweet Pea supposed to do if she has to get up to pee in the middle of the night? Can she climb down the mattresses fast enough to avoid peeing her pants?