This wordless, illustrated story follows Oscar and his father as together they wander through BostonÕs lively streets and parks, they begin to notice the hidden world beneath their feetÑwater rushing through pipes, trains gliding through tunnels, tree roots stretching deep underground. With every step, the city reveals its secrets, inviting readers to look closely, wonder, and discover the magic of what lies unseen. From sunrise to sunset, the city hums with life, connected in ways both big and small, waiting to share its stories.