I know that Killer 7 is more than half a year old but if you are a fan of the game you should check out this detailed Plot Analysis for the game:

http://db.gamefaqs.com/console/gamecube/file/killer7_plot.txt

It's quite the read. It's been out for awhile but it gives you an insight into what that game is all about. I had a great time reading it and it really makes you think.

Check it out.

PS. Killer 7 would make one hell of a rad flick! Just imagine this cast:

Samuel L. Jackson as Garcian

Clint Eastwood as Harman Smith

Natalie Portman as KAEDE Smith (she could pull it off)

Jared Leto as Dan Smith

Hugh Jackman as Coyote Smith

??? as MASK De Smith

Elijah Wood as Con Smith

Giovanni Ribisi as Kevin Smith

Benici Del Toro as Kun Lan (they could make him look Japanese and for some reason I could just imagine him being awesome in this part)

...then you could get someone awesome like Chis Walken to be Traivs haha