We all know the main story of Abraham Lincoln's death, how he was killed, where it took place, and who pulled the trigger. But what exactly happened during the last day of his life? Relive April...

　　在位于阿帕拉契山脉的乡间小镇地底下，有座已燃烧数十年的废弃煤矿。一支研究小队前往该地试图找出当年矿坑起火燃烧的原因，却意外挖掘出更令人吃惊的恐怖秘密……...