Is was "tomorrow", Saturday.
Interestingly enough, there is a TV listing site that has a list of shows that are "on the bubble" to be cancelled or renewed and Harper's Island was among them. Obviously, this is a one-shot show, but I guess they are considering it a series of somesort. Not that show specifically, but shows like it.
I wouldn't mind seeing more shows like this, but I would hope they were better done in the future. And not just murder after murder, but get creative in how people end up leaving the show. Half of the effort in Harper's Island is trying to figure out ways to make it so nobody questions why someone is missing. They've explained a few of them, but there are a few disappearances that just seem to be "out of sight, out of mind" like the girl who was burned in the pit.
They did explain away the uncle and no one ever saw the cousin in the first episode, so that was fine.
The second episode was the pastor who was supposed to help them with the treasure hunt, so someone should have noticed him missing, but other than that, wouldn't have played in much.
Also, the hanging, which is public knowledge, so no big deal, and the girl in the pit, which I've already mentioned.
Episode three was the ex-boyfriend and he was leaving anyway, so that was fine. Last night was the guy in the woods. The one groomsman was there and it wasn't a case of even murder, but an accident. However, he can't tell anyone about it without explaining what happened to the money, so he's trying to cover it up and they may or may not have him try to come up with a story later to explain why Booth isn't around anymore.