Thicker Than Water

Hawke works for the assasin guild of Black Hawk. Take a life, get paid. That's how Hawke lived. That is, until he got his newest assignment; one like none before.
This one was a girl about his age, unlike the usual older men that Hawke was used to taking out. He couldn't bring himself to kill the girl, and now both the girl and Hawke are on the run from his old guild, who want to take both of them out.