Carnival at Candlelight by Mary Pope Osborne

Jack and Annie travel to Venice during Carnival season to save the city from a looming disaster. Disguised in masks and cloaks, they explore canals, meet artists, and try to solve a mysterious riddle. When the city begins to flood, they must act quickly and use their knowledge—and a bit of magic—to turn the tide. The story mixes real history and fantasy in a vibrant setting full of wonder. It’s a fast-paced adventure through one of the world’s most enchanting cities.