Inthehistoricmeltingpotof19thcenturyNewYorkCity,FievelandtheMousekewitzfamilyarestrugglingtomaketheirAmericandreamcometrue.ButwhenamysterioustreasuremapleadsFievelandhisfriendstoasecretworldofNativeAmericanmicelivingbeneaththecity,hefindssomethingevenmorepreciousthangoldandjewels!