When siblings Siora and Lenor inherit two mysterious stone tablets, they discover each can conjure shimmering bridges at any river or mountain pass. Their first test at the U.S.–Canada border reveals a shared forest guided by First Nations and Native American guardians. From alpine lodges in Austria and Italy to savannah herders in Kenya and Tanzania—and even a wildlife sanctuary at the Korean DMZ—each crossing teaches them how communities cooperate across lines. Combining topographical sketches with folk-song recordings, the duo compiles a "Cultural Bridges" exhibit. This fun, comical adventure shows young readers that borders can unite hearts, cultures, and nature rather than divide them.