Well this sucks

So I have ben writing my novel for almost two years now, and somehow I have lost the latest full version on a disk somewhere. Strangely enought, I found the beginning part on one computer, and another part on another computer. What sucks is that I am missing one important chapter and can't complete the story without it. And of course I don't have the rought copy either so I am stuck until it is found. Lame.