Katie Kicklighter loves wearing mismatched socks, dancing with or without a partner, spending time with her friends Maggie and Trey, and inspecting the world through the lens of her trusty magnifying glass Trixie. But most of all — she's curious … about everything. If there's something she discovers, she wants to learn everything there is to know about it. It's that same curiosity that thrusts Katie into a wild adventure in her quest to find the castle gold during a class trip to Europe. But it's also what lands her in a dilemma and forces her to be resourceful, not just to save the treasure but also to save her friends and herself.