I dismissed this one at first because of a number of spelling and grammar errors in the first few chapters. I was encouraged by others to keep reading past that point however, and I'm glad I did; the author gets a beta around chapter 5 or so and the story improves dramatically after that point. Neoalfa has indicated that he plans to go back and redo those chapters eventually, so until then just muscle through the beginning and get to the good stuff.
This fic does something that very few other stories do, and the ones that do it often do poorly; it focuses on a time period outside of the Grail Wars for a significant part of the story. The first arc focuses on Shirou and Rin teaming up to solve a kidnapping which turns into a much larger problem towards the end of the arc. It's refreshing to see the characters interact in unfamiliar circumstances, and moreso when it becomes apparent how exactly this arc eventually ties in to the Grail War. The climax of the first arc is pulled off beautifully, and was sufficiently epic that I felt the need to open up You Tube
and turn on EMIYA while I was reading.