Welcome to an enchanted land ruled by unicorn princesses! Cressida Jenkins, a unicorn-obsessed girl who is sure that unicorns are real, is invited to visit, and readers will be thrilled to journey to the Rainbow Realm along with her! In each story, Cressida is called to help a unicorn princess and her sisters in a magical adventure. Journey to the Shimmer Caves on an adventure with Princess Firefly, the orange unicorn who can create beautiful swirls of fireflies with her magic amber gemstone. Firefly loves reading more than anything else! She's spent months creating the best library for all the creatures in the Rainbow Realm, but Ernest the blundering wizard lizard casts a spell that might ruin the grand opening. Will Cressida be able to find a way to save all of Firefly's hard work? This magical series is full of sparkle, fun, and friendship.