Sapphire is ready for a summer full of fun at Camp Explore, which is in the Great Forest of Sunshine Springs, far away from her ocean home. The famous Amelia Hoofheart, Sapphire's role model, was a camper at Camp Explore long ago, and Sapphire dreams of following in her hoofprints. Sapphire will miss her home and friends, but Comet, Shamrock, and Twilight promised to send her postcards, and Sapphire is sure she'll make new friends at camp. It seems like things are off to a good start when camp kicks off with some friendly pranks, but then Sapphire realizes the unicorns aren't pranking her at all. They really think she's Princess Nova, princess of the Five Kingdoms! But a princess wouldn't be attending a summer camp in the middle of the forest...right?