鲍伯（成龙 饰）与独自带着三个孩子的女邻居吉莉安相恋曾经三个月了，但是三个小鬼并不怎样喜欢这个窝囊、有趣，似乎机器人般一程不变的钢笔商，但鲍伯其实是一名行将退休的秘密特工。吉莉安因故外出，鲍伯决议由他来照顾孩子，一个大男人要应付三个古灵精怪的小孩子曾经足够让他头疼，而孩子们有意间下载了一伙罪犯的细菌配方引来了坏人的追杀，此时，中情局外部也有人想失掉配方。在维护孩子们的进程中，鲍伯的身份爆光，吉莉安...

Joanna's holiday is shattered when her sisters tell her that their dad has dumped, he isn't responding to any calls and disappeared to a Caribbean island. The sisters decide to go to save their father...