应该是《触不到的恋人》~
剧情：
A lonely doctor (Bullock) who once occupied an unusual lakeside home begins exchanging love letters with its newest resident,a frustrated architect (Reeves).They must try to unravel the mystery behind their extraordinary romance before it's too late.
一个清冷的早晨,短发俏丽的凯特·福斯特（桑德拉·布洛克）即将离开伊利诺伊州美丽的湖边小屋,去繁忙的芝加哥医院工作.不愿离开这个宽敞明亮、甚至还能在房中看到湖景的地方的凯特,离开时在门外的信箱里留下了一笺信纸,希望小屋的下一个住客能和自己联系,信里还顺便解释说前门擦不掉的爪印早在自己搬进的时候就已存在,希望不要介意.
湖边小屋的下一任房客阿历克斯·韦勒（基努·李维斯）,是一个天赋过人却迷失了方向的建筑师.小屋对阿历克斯有着特殊的意义,这是多年未见的著名建筑师父亲的设计,早已物是人非的小屋,在阿历克斯眼里完全是无人问津的模样：布满灰尘、杂草丛生,前门也并没有凯特一直念叨的爪印.
在收拾东西、重建小屋的时刻,阿历克斯开始享受湖边的美丽的意外的平静,而对于凯特留下的信笺,他完全无动于衷.直到数天后,一条迷途的大狗无意踩过他刚漆好的防波堤,在小屋前门留下凯特提到的爪印,疑惑不解的阿历克斯终于决定回信追问凯特为何知晓从未有过其他住客的湖边小屋和鲜活的狗爪印.在信件的往来里,两人交谈琐事、希望、失落和一切,却也发现之间竟然相距两年的时空,逐渐相爱的两人之间的联系,只是那个伫立在湖边小屋旁的信箱而已.
这是歌词：
I came across a fallen tree,
I felt the branches of it looking at me.
Is this the place we used to love?
Is this the place that I've been dreaming of?
Oh,simple thing,where have you gone?
I'm getting old and I need something to rely on.
So tell me when you're gonna let me in,
I'm getting tired and I need somewhere to begin.
And if you have a minute why don't we go,
Talk about it somewhere only we know?
This could be the end of everything.
So why don't we go,somewhere only we know,
Somewhere only we know.
