I left the IC opening where it was to give the opportunity to you guys to do some back-dating, detailing how your characters came to the city, any pre-campaign life you'd like to detail, and then a chance to introduce yourselves to each other and decide how to tackle the task before you. There was a pretty even split between the players travelling as one large group and players splitting up and tackling cities separately, so I didn't want to force anyone together who may have preferred to strike out on their own.