太平洋某座生物研究所內，最新研究的魚類加速繁殖計劃得到了突破，并在繁殖力極低的鯊魚身上試驗成功。實驗室的科學家們大喜過望，稱這項研究將徹底解決全球食物問題。只有總負責人博士袁聰認為此舉會破壞現有的生態環境，力排眾議下令銷毀實驗鯊魚。然而實驗組的副手莫雷將這些鯊魚看成畢生心血，偷走幾條幼鯊準備轉移，誰知在路上被咬傷出了事故，幼鯊逃進下水道進入了大海。沒過多久，若干處海邊出現鯊魚群體襲擊事件，原來這些鯊魚的背后有一只超級巨大的母鯊......

　　江繼威（吳奇隆飾）和洪欣欣（楊采妮飾）同在七夕節去月老廟求姻緣，江繼威對外表清純的張小盈（張庭飾）一見鐘情，卻因失神撞了想要偷拿紅繩的欣欣，惱火的欣欣旋即對其展開“報復”行為，兩人變成見面就吵的冤家。　　兩星期后，欣欣在戲臺上吊嗓時，卻看見了江繼威的鬼魂，原來江繼威上了張小盈的當，被卷入搶劫案中繼而被滅口。不甘心的江繼威借助電線回到陽間，且歪打正著跑到欣欣所在的劇院。他希望欣欣可以幫他回到過去，挽回自己被殺的命運。欣欣最終經不住江繼威的懇求，和他一起回到了兩星期前。

　　After serving two years on a military outpost in the middle of an ocean – four soldiers are waiting for a new crew to replace them. When the long-awaited boat finally appears, it’s empty with no relief on board. When trying to find out what happened to the boat and the missing crew, they realize they’ve lost all communications with home. Cut off from the rest of the world and no one coming to get them, Baines, Sullivan, Cassidy and Hendryx must fight with suspicions about each other and find a new way to get home. If home still exists.

A noir portrait of Italy in the Seventies.