The Time Travellers Wife is one of my favourite books, and I have to say this is a gorgeously written fic. It's awfully hard to find good Steve/Kono fic - as I think we all know, about 98% of the fic in the Hawaii Five-O fandom is Steve/Danno (not that there's anything wrong with that, but it's nice to read something different every once in a while!)
Bottom line - it's brilliant, go read it! (But be warned it's long and you may need a tissue at the end).
Link goes to the masterpost: But World Enough, and Time by ratherastory