Oh my god, that opening. And that ending! ...Oh, and everything between. This -right here- is a diamond in the rough. 
 It started with just the right amount of mystery; the kind that draws you in and makes you thirsty for answers. Every damn line sold me - not only on the story itself but on the relationship between the characters. You could feel the admiration in the way Antho described his pretty assassin; little details that only someone in love would pick up on. It was sweet (borderline obsessive, but in a charming way), but all the while you could tell it was laced with something painful. It built anticipation. And the fact it was written as a letter made it all the more intimate. Clever approach for a romance. 
 I don't know how the author managed to make this play out like a movie in my head with such straightforward and abrupt sentences. The words were chosen carefully - the style nice and sharp. I was especially fond of the pacing and how Antho moves everything right along. I'd maybe criticize the lack of answers (view spoiler)[such as why he killed his target and what caused him to forget everything (hide spoiler)], BUT it was forgivable in this situation because of the amnesia (and could possibly be detailed in other parts of the series... which I might just have to read now). 
 Honestly, I can't compliment it enough. The writing was flawless and turned me into an instant fan. I was so lucky to stumble on this. 
 Now you're the lucky one: go read it.