Yee-Ming
Senior HTF Member
I'm not sure that the premise of Harper's Island is amenable to another season anyway, assuming that the mystery as to who the killer is, and why he/she is doing it, is revealed by the end of this season.
Perhaps sometimes the problem with network television is that a show with an intriguing, but time-limited premise, becomes a hit and the network suits insist on more seasons, and the producers/writers have to come up with all sorts of twists to drag things out? For recent shows, Prison Break in particular comes to mind, with the creator initially saying he had a two-season storyline in mind, and certainly that seemed to be the case, but being such a success the suits wanted more and S3 seemed odd to say the least (I haven't seen S4 yet so can't comment further on that). For that matter I think Lost might have suffered from the same problem, in that the main storyline could be told in probably 3 seasons or so, but again because of its success, it has to be dragged out and filler-storylines created to pad out the episodes.
This seems most obvious when comparing networks shows to cable shows, who are happy with 13-show seasons, leaving a much tighter storyline with little or no filler.