11岁的本恩觉得自己80多岁的奶奶只会嚼薄荷糖、玩拼字游戏，身上全是臭臭的圆白菜味儿，他讨厌和奶奶待在一起。但是有一天，奶奶要带他去冒险，本恩开始研究地下管道，练习游泳，学习各种逃生技巧……当他和奶奶...

It’s Christmas time on Saint Marie and Neville is preparing to head to Manchester to spend the holiday with his family. But his plans are abruptly cha