I Beg Your Pardon makes an excellent hook and definitely gets things moving right off the bat. So then the question would be, who is being attacked? Will all the characters be attacked together by NPCs, or will they be set against each other from the start? What is the motivation? Most of the time things don't just happen for the evuls (though I suppose that also counts as a motivation, really). Maybe it's an insert-cool-name-here-thing-of-powerful-whatever that everyone wants (see Breaking and Entering, How Much for Just the Dingus, or Quest for the Sparkly Hoozits). Maybe they need control over a place (Capture the Flag, No One Has Soiled the Bridge). Maybe it's because they're about to get caught up in a Troublemakers plot. Just suggestions, please tell me if I'm being annoying, I just love to plot.