probably finding the reason would have to take place during the day but during the night you would have to survive the attacks untill day break. Eventually you'll find an entrance to an old looking cavern system on the outskirts of town that spans the entire town of salem.
I can keep going but all I'm saying they could have made that place a lot more atmospherical.
I just enjoy a good creepy atmosphere.
So what would you liked to have seen in salem that would have gave you that eerie vibe? What type of mission would you substitute for that "power on the turrets mission"?