A lovely story, made even better by the author's explanation about the origins. Very cool, and I quite liked Iris, so what a nice tribute to your grandma.
It was clear in the first scene that that was going to be a con, though I might've been more aware of it because of the cons performed in Zombieland (great movie, btw).
The pace was a little slow for my usual tastes, but it fit the story, so I'm not really complaining. The only thing that didn't really resonate with me was the fact that Iris didn't really get conned in the end. He tells her time and time again that he only cons the dishonest (which is a cool premise) but then when she becomes dishonest he never really cons her, she comes out even in the whole ordeal. So he didn't really live up to his promise, even though I would've been sad if he'd ripped her off.