途徑鬧市的解款車錢箱跌出馬路，吸引市民瘋狂執錢。典型毒男關正傑（林耀聲 飾）及其好友雷安明（游學修 飾 ）案發當日身在現場，卻無份執錢，對事件產生好奇。因此在高登討論區成立「起底組」，主動調查解款車事件，更吸引高登女神Jun（鄧月平 飾）加入。與拜金妹妹柯梓盈（陳凱琳 飾）相依為命的休班O記女警員柯梓楠（鄧麗欣 飾），因獨力守護錢箱成為警隊英雌，更被安排加入「解款車跌錢案」的調查小隊。 警方相信案件純屬意外及難以尋回所有失鈔，決定解散調查小隊，但起底組調查下去，發現事件表面看似一單普通意外，原來大有陰謀！
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