Seven years ago, as Camm Smith herded a pack of little trick-or-treaters past the decaying mansion in her hometown of Trona, California, her young neighbor Hugh disappeared, becoming the latest in a string of vanished children. Now a high school senior, Camm is still haunted by the old tragedy and is convinced the answer lies hidden in the abandoned house. Joining forces with her best friend, Cal—who happens to be Hugh's older brother—Camm naively begins a perilous search for the truth. Events quickly spiral out of control, however, and as more people begin to die, Camm and Cal discover it will take all of their combined ingenuity to fend of the evil being lurking deep within the bowels of the mansion and federal agents determined to keep old secrets permanently hidden. The two friends must race against the clock to discover the truth about the house before they, too, disappear without a trace.