C'est la vie

　　美國FBI鑑識調查組探員道格卡寧在調查一樁遊艇爆炸案時，發現這樁爆炸案可能與另一起少女謀殺案有關。隨著調查發展，道格被派任到FBI的另一個新單位。這個部門賦予道格使用「時空之窗」的權限，所謂的「時空之窗」是一個極機密且先進的武器，但透過時空之窗卻只能停留在「過去」四天六小時又數分鐘，一分不多，一秒不少。透過這扇時空之窗，道格回到過去試圖阻止一樁少女的謀殺案件，同時也必須阻止一場恐怖行動的執行。

Everyone has experienced the unsettling mystery of déjà vu--that flash of memory when you meet someone new you feel you’ve known all your life or recognize a place even though you’ve never been there before. But what if the feelings were actually warnings sent from the past or clues to the future? It is déjà vu that unexpectedly guides ATF agent Doug Carlin through an investigation into a shattering crime. Called in to recover evidence after a bomb sets off a cataclysmic explosion on a New Orleans Ferry, Carlin is about to discover that what most people believe ”is only in their heads” is actually something far more powerful--and will lead him on a mind-bending race to save hundreds of innocent people.