Some time after the Mousekewitz's have settled in America, they find that they are still having problems with the threat of cats. That makes them eager to try another home out in the west, ...

在19世纪纽约市的历史熔炉中，费维尔和穆塞克维茨家族正努力实现他们的美国梦。但是当一张神秘的宝藏地图带领菲维尔和他的朋友来到一个居住在城市下面的美洲土著老鼠的秘密世界时，他发现了比黄金和珠宝更珍贵的东西！...