内容简介：
In celebration of Smart McMice's fifteenth birthday, his family takes him to a theme park to spend a day enjoying rides and attractions. But Smart is only interested in one of the park's features: a tall wall. When Smart becomes a little too curious about the wall, he ends up disappearing altogether. Losing their beloved Smart to his curiosity, his family pulls out all the stops to try and find him. What Smart's rescuers end up finding is beyond what they ever could have dreamed of discovering. Follow along as the adventure and fun unfold on the isle of Miceland.