伊万（艾什顿·库彻 饰）曾经有一个糟糕的童年，因为他行为闯下了大祸，令他童年充满不堪回忆的往事。而事实上，他确实只是依稀记得一点可怕的情景，这些情景一直纠缠着他的正常生活。伊万接受心理学家建议，把琐碎生活记在记事本里，却偶然发现通过记事本回到过去。 这时他才清楚记起，童年时候的自己做了那么多的...错事。他幻想着用现在的意识，潜入童年的身体，去弥补种种过失给人们带来的伤害，尤其是希望与当年暗恋的凯蕾（艾米·斯马特 饰）最终走回一起。然而他一次次的跨越时空的更改，只能越来越招致现实世界的不可救药。一切就像蝴蝶效应般，牵一发而动全身。
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