I prompted Willy a while ago about the quest, but my persuasion skill wasn't up to scratch... He continues to offer the quest up untill I put that final point into persuasion to complete the bar, and the cue to take the quest dissapears! I fear that it is because I accepted the assassination quest.. Anyone encountered this problem before?
I believe you are correct! Once you can accept the quest (5 points) the assasin quest kicks in. Parmanian