David Paulides has a series of video's and books about "missing 411". They are about mysteriuos dissappearances often in national parks and the strange similarities and inexplicable mystery surrounding these events. I am one who loves the out doors and camping and walking around in the forest, so although i found the mystery fascinating i tried not to watch too much to spook myself.
There is a bunch of Paulides videos available, I watched one of a Nexus conference i think just a few years back, but it was in australia... so..yeah, but anyway it was quite interesting and it's on youtube. Anyone else seen it? Apparently he wrote several books on the matter of these strange seemingly connected disappearances, and alothough he explicitely didn;t draw ant conclusions in his books, he also wrote a book on Bigfoot. Yikes!